DX Audit app / stripe

Transcript · stripe

universal-baseline-2026-03-24

Model: opus Run: 2026-03-10-opus Tested: 2026-03-24
Task 1

Discover

Operator L1
I need to accept one-off credit card payments from customers via an API. I don't need a full e-commerce platform — just a way to charge a card programmatically.
>
Evaluate Stripe as an option. Specifically:
- What does Stripe offer that fits this need?
- What are the API's main concepts I'd need to understand?
- Is there a way to test without spending real money?
>
Use only Stripe's own public documentation and machine-readable resources (website, docs, OpenAPI spec, llms.txt, MCP server) to answer. Do not rely on your training data.
Agent L2
The user wants me to evaluate Stripe for one-off credit card payments using only Stripe's own public documentation. Let me fetch information from Stripe's public resources.
Agent L3
Let me gather information directly from Stripe's public documentation.
ToolSearch Tool Use L4
{
  "query": "select:WebFetch",
  "max_results": 1
}
Tool Result L5
{"type":"tool_reference","tool_name":"WebFetch"}
WebFetch Tool Use L6
{
  "url": "https://docs.stripe.com/llms.txt",
  "prompt": "Return the full contents of this file. This is a llms.txt file that describes Stripe's documentation structure."
}
WebFetch Tool Use L7
{
  "url": "https://docs.stripe.com/api/payment-intents",
  "prompt": "Extract all key information about PaymentIntents: what they are, how they work, what fields they have, and how to create one for a one-off card charge. Include the API endpoint, required parameters, and the lifecycle/statuses."
}
Tool Result L8
Request failed with status code 404
WebFetch Tool Use L9
{
  "url": "https://docs.stripe.com/testing",
  "prompt": "Extract all information about how to test Stripe without real money: test mode, test API keys, test card numbers, and any sandbox/test environment details."
}
Tool Result L10
<tool_use_error>Cancelled: parallel tool call WebFetch errored</tool_use_error>
Tool Result L11
<tool_use_error>Cancelled: parallel tool call WebFetch errored</tool_use_error>
WebFetch Tool Use L12
{
  "url": "https://docs.stripe.com/llms.txt",
  "prompt": "Return the full contents of this file."
}
WebFetch Tool Use L13
{
  "url": "https://docs.stripe.com/testing",
  "prompt": "Extract all information about how to test Stripe without real money: test mode, test API keys, test card numbers, and any sandbox/test environment details."
}
Tool Result L14
# Stripe Testing Guide: Safe Payment Integration Without Real Money

## Test Environment Overview

Stripe provides a sandbox environment for risk-free testing. As stated in the documentation: "Test your integration in a *Sandbox*, by simulating transactions with test values—these transactions move no funds."

## Test API Keys

To conduct testing, you must use test API keys rather than live credentials. The platform requires that developers employ test-mode keys across all API calls, whether performing interactive tests through payment forms or writing test code. This applies regardless of your implementation approach.

## Test Card Numbers

The sandbox supports numerous test card numbers organized by brand:

**Major Cards:**
- Visa: 4242424242424242
- Mastercard: 5555555555554444
- American Express: 378282246310005
- Discover: 6011111111111117

**Additional Types:**
- Visa Debit, Mastercard variants (Debit, Prepaid), Diners Club, JCB, and UnionPay options are available

For any test card: use any future expiration date (like 12/34) and any 3-4 digit security code.

## Payment Method Objects

Rather than card numbers in API calls, use payment method identifiers like `pm_card_visa`, `pm_card_mastercard`, or country-specific variants like `pm_card_us`, `pm_card_fr`, etc.

## Critical Warning

The documentation explicitly states: "Do not use real card information. The Stripe Service Agreement prohibits testing in live mode with actual payment method details."

## Transition to Production

When ready for live transactions, replace test keys with production credentials and update PaymentMethod references accordingly.
Tool Result L15
# Stripe Documentation - Full Contents

This document provides a comprehensive index of Stripe's official documentation, organized by product and feature category.

## Key Sections Overview

**Getting Started & Core Concepts**
The documentation begins with instructions for LLM agents, emphasizing that integrations should prioritize the Checkout Sessions API with Payment Element, avoid deprecated endpoints like the Charges API and Sources API, and default to the latest API versions unless otherwise specified.

**Payment Processing**
Stripe's primary payment tools include the Checkout Sessions API for backend processing and Payment Element or Checkout for frontend implementation. Documentation covers accepting payments online, the Payment Intents API, multi-currency settlement, and payment method integration options.

**Payment Methods**
Support spans global payment options including cards, bank debits, buy-now-pay-later services (Afterpay, Affirm, Klarna), bank transfers, real-time payments, wallets, and regional methods like Cartes Bancaires in France and eftpos in Australia.

**Link Feature**
This allows customers to save payment details for faster checkout across Link-enabled businesses, supporting instant bank payments with immediate confirmation and settlement timelines matching card payments.

**Billing & Subscriptions**
Stripe Billing automates recurring payments, manages subscription lifecycles including trials and renewals, handles usage-based pricing, and integrates with checkout for subscription management.

**Financial Services**
- **Connect**: Platforms and marketplaces managing multi-party payments, using the recommended Accounts v2 API for new integrations
- **Treasury**: Embedded finance for connected accounts including financial accounts, money movement, and cash management
- **Issuing**: Card creation and management in the US, UK, and EEA
- **Identity**: User verification from 120+ countries with document authentication and selfie matching

**Compliance & Reporting**
- **Tax**: Automates sales tax, VAT, and GST across 200+ jurisdictions
- **Revenue Recognition**: Accrual accounting automation for GAAP/IFRS compliance
- **Invoicing**: Invoice creation, management, and automated payment collection

**Fraud & Risk**
Radar provides real-time fraud protection through machine learning, with customizable rules and risk controls. Documentation covers dispute prevention, card verification, and fraud trend analysis.

**In-Person Payments**
Terminal enables card reader integration for physical locations, supporting various reader models and location management across fleets.

**Additional Products**
- **Payment Links**: Share-friendly payment pages without building storefronts
- **Atlas**: Company incorporation and tax ID services
- **Financial Connections**: Secure bank account data sharing for ACH verification and underwriting
- **Capital**: Financing access for eligible Stripe processors
- **Climate**: Carbon removal financing integration
- **Crypto**: Stablecoin payment acceptance with onramp options
- **Sigma**: Custom SQL-based reporting on transaction data

## Critical Guidance for Developers

The documentation emphasizes always checking current package versions via npm registry or PyPI rather than relying on memorized numbers. It advises users to enable dynamic payment methods in dashboard settings instead of hardcoding specific payment method types, and recommends the Setup Intent API for saving customer payment methods rather than deprecated alternatives.

For Connect platforms, the documentation strongly encourages using Accounts v2 API with configuration properties like `defaults.responsibilities` and `dashboard` settings, describing accounts by their responsibilities rather than legacy type parameters.
WebFetch Tool Use L16
{
  "url": "https://docs.stripe.com/payments/payment-intents",
  "prompt": "Extract all key information about PaymentIntents: what they are, how they work, how to create one for a one-off card charge, the lifecycle/statuses, and required parameters. Include code examples if present."
}
WebFetch Tool Use L17
{
  "url": "https://docs.stripe.com/payments/accept-a-payment",
  "prompt": "Extract the key steps to accept a one-off payment with Stripe. What are the main API objects involved? How does the flow work server-side? Include any code examples."
}
Tool Result L18
# Payment Intents API Overview

## What They Are

Payment Intents represent a Stripe object that manages the complete payment lifecycle. According to the documentation, they "track payments from creation to checkout and trigger additional authentication steps as needed." Each PaymentIntent typically corresponds to a single shopping cart or customer session.

## Key Benefits

The API offers several advantages:
- Automated authentication processing
- Prevention of duplicate payments
- Support for Strong Customer Authentication (SCA) and regulatory compliance
- Proper idempotency key handling

## How to Create One

To create a PaymentIntent for a basic card charge, make a server-side API call:

```curl
curl https://api.stripe.com/v1/payment_intents \
  -u "<<YOUR_SECRET_KEY>>:" \
  -d amount=1099 \
  -d currency=usd
```

**Required Parameters:**
- `amount` - transaction amount in cents
- `currency` - three-letter currency code (e.g., "usd")

## Lifecycle & Status

The PaymentIntent has a status that changes throughout its lifecycle. The documentation explains that developing an integration requires "creating and confirming a PaymentIntent." Confirmation indicates "the customer intends to pay with the current or provided payment method."

## Client Implementation

Pass the `client_secret` (a unique key from the PaymentIntent) to your frontend, where Stripe.js uses it to complete payment via methods like `stripe.confirmCardPayment()`.

## Best Practices

- Create a PaymentIntent as soon as you know the amount
- Reuse the same PaymentIntent if payment is interrupted and resumed
- Use an idempotency key to prevent duplicate PaymentIntents
- Never log or embed the client secret in URLs
- Store metadata (like order IDs) for reconciliation purposes
Tool Result L19
# Key Steps to Accept One-Off Payments with Stripe

## Main API Objects

The primary objects involved in Stripe's payment flow are:

1. **Checkout Session** - Represents the customer's session during payment processing
2. **Payment Intent** - Manages the payment authorization and capture process
3. **Line Items** - Define what products/services are being purchased
4. **Customer** - Stores customer information for transactions

## Server-Side Flow

The fundamental server-side process follows these steps:

**Step 1: Create a Checkout Session**

Your server receives a request to initiate payment and creates a session using the Stripe API. As shown in the documentation, you configure the session with product details:

```ruby
session = Stripe::Checkout::Session.create({
  line_items: [{
    price_data: {
      currency: 'usd',
      product_data: { name: 'T-shirt' },
      unit_amount: 2000,
    },
    quantity: 1,
  }],
  mode: 'payment',
  success_url: 'https://example.com/success',
})
```

**Step 2: Return Client Secret**

The session generates a `client_secret` that must be returned to your frontend, enabling secure payment processing on the browser.

**Step 3: Process Webhook Events**

After payment completion, Stripe sends webhook events (like `checkout.session.completed`) that trigger server-side fulfillment actions—sending confirmations, updating inventory, or initiating shipments.

## Integration Recommendation

The documentation emphasizes that "Stripe recommends using the Checkout Sessions API with the Payment Element over Payment Intents for most integrations" because it reduces custom code requirements significantly.
WebFetch Tool Use L20
{
  "url": "https://docs.stripe.com/payments/charges-api",
  "prompt": "What does Stripe say about the Charges API? Is it deprecated? What should be used instead? Extract all relevant details."
}
WebFetch Tool Use L21
{
  "url": "https://docs.stripe.com/payments/payment-intents/migration/charges",
  "prompt": "Extract information about migrating from Charges API to Payment Intents. What's the difference? Why was the change made?"
}
Tool Result L22
# Stripe's Charges API Assessment

## Status
The Charges API is classified as a **Legacy API** — technology that is "no longer recommended." Stripe explicitly states it's an older integration method that should not be used for new implementations.

## Key Limitations
Stripe highlights that the Charges API "restricts your ability to use Stripe features" and lacks support for:
- Businesses in India
- Bank requests for card authentication
- Strong customer authentication

## Recommended Alternatives
Stripe recommends two solutions:

1. **Payment Intents API** — The primary successor for new integrations, offering "more flexibility and integration options"

2. **Stripe Checkout** — For those seeking additional functionality

## Migration Guidance
For existing implementations, Stripe encourages users to "migrate to the Payment Intents API" to access the latest features and maintain compliance with credit card regulations that the legacy Charges API cannot support.

The documentation emphasizes that newer methods provide essential regulatory compliance features absent from the Charges API approach.
Tool Result L23
# Migration from Charges API to Payment Intents

## Key Differences

The **Charges API** was primarily designed for simple card acceptance in the US and Canada, while the **Payment Intents API** offers broader functionality. According to the documentation, "new features only with the Payment Intents API" are available, though Stripe continues supporting the Charges API.

The Payment Intents API provides several advantages:

- **Regulatory compliance**: It is "SCA-fähig" (capable of supporting Strong Customer Authentication), which European regulations require
- **Payment method diversity**: Supports cards requiring 3DS, iDEAL, SEPA, and numerous additional payment methods
- **Omnichannel support**: Works across web, iOS, Android, and in-store with Terminal

In contrast, the Charges API is "not SCA-fähig" and has more limited payment method support.

## Migration Path

Rather than a forced transition, Stripe recommends a gradual approach. When updating code, developers should modify sections reading from charge objects by utilizing two new properties: `payment_method_details` and `billing_details`. These fields provide "a consistent interface for reading payment method details" across both APIs and all versions.

The documentation includes detailed mapping tables showing how to access the same information through updated property paths—for example, changing from `charge.source.last4` to `charge.payment_method_details.card.last4`.
Agent L24
Now I have enough information from Stripe's own documentation. Here's the evaluation:

---

## Stripe Evaluation: One-Off Credit Card Payments via API

### What Stripe offers for this need

Stripe provides two API paths for charging a card programmatically:

1. **Payment Intents API** — The recommended approach. You create a `PaymentIntent` with an `amount` and `currency`, then confirm it with a payment method. This handles the full payment lifecycle including authentication (3D Secure), regulatory compliance (SCA), and duplicate prevention.

   ```bash
   curl https://api.stripe.com/v1/payment_intents \
     -u "sk_test_xxx:" \
     -d amount=1099 \
     -d currency=usd
   ```

2. **Checkout Sessions API** — Stripe's own docs recommend this for most integrations. It bundles a PaymentIntent with a hosted or embeddable UI, reducing custom code. Better if you have any frontend at all.

The older **Charges API is legacy** — Stripe explicitly says not to use it for new integrations. It lacks SCA support and won't receive new features.

### Key API concepts

| Concept | What it is |
|---|---|
| **PaymentIntent** | Tracks a payment from creation through confirmation to completion. One per transaction. |
| **PaymentMethod** | Represents the card (or other instrument). Attached to a PaymentIntent to charge it. |
| **Customer** (optional) | Stores a payer's info. Not required for one-off charges but useful if you want to save cards for later. |
| **client_secret** | A per-PaymentIntent key passed to the frontend so Stripe.js can complete confirmation securely. |
| **Webhooks** | Server-side notifications (e.g., `payment_intent.succeeded`) for asynchronous confirmation of payment outcomes. |
| **Idempotency keys** | Prevent duplicate charges if a request is retried. |

The flow: **Create PaymentIntent (server) → Confirm with PaymentMethod (client or server) → Handle result via webhook**.

### Testing without real money

Stripe has a full **Sandbox / test mode**:

- **Test API keys**: Every account gets `sk_test_...` and `pk_test_...` keys. All API calls made with these keys are simulated — no real money moves.
- **Test card numbers**: Use these in the sandbox:
  - `4242 4242 4242 4242` — Visa (succeeds)
  - `5555 5555 5555 4444` — Mastercard (succeeds)
  - `378282246310005` — Amex (succeeds)
  - Any future expiry date (e.g. `12/34`) and any 3-digit CVC.
- **PaymentMethod shortcuts**: In API calls, use tokens like `pm_card_visa` or `pm_card_mastercard` instead of raw card numbers.
- **Critical rule**: Stripe's terms prohibit using real card details in test mode.

To go live, you swap test keys for live keys — the API calls are identical.

### Bottom line

Stripe is a strong fit for this use case. The PaymentIntent API is purpose-built for one-off charges, the test sandbox is fully functional, and you can go from first API call to charging a card in minimal code. The main thing to understand is the PaymentIntent lifecycle and that you should use the Payment Intents API (not the legacy Charges API).
Task 2

Setup

Operator L26
Set up a Stripe account so we can start making test API calls. Get to the point where you have a working API key in test mode. Do as much as you can autonomously. If you need me to do something (like verify an email, enter personal details, or complete identity verification), tell me exactly what you need and wait for me to confirm it's done.
Agent L27
Agent L28
Let me open Stripe's signup page in your browser.
ToolSearch Tool Use L29
{
  "query": "select:mcp__claude-in-chrome__tabs_context_mcp,mcp__claude-in-chrome__navigate,mcp__claude-in-chrome__tabs_create_mcp",
  "max_results": 3
}
Tool Result L30
{"type":"tool_reference","tool_name":"mcp__claude-in-chrome__tabs_context_mcp"}
{"type":"tool_reference","tool_name":"mcp__claude-in-chrome__navigate"}
{"type":"tool_reference","tool_name":"mcp__claude-in-chrome__tabs_create_mcp"}
mcp__claude-in-chrome__tabs_context_mcp Tool Use L31
{
  "createIfEmpty": true
}
Tool Result L32
{"availableTabs":[{"tabId":747477677,"title":"AI Shadow Shopping Report: Skincare — PerformKit","url":"http://localhost:8765/research/skincare-2026/"},{"tabId":747477517,"title":"DataForSEO","url":"https://app.dataforseo.com/users/getrows"},{"tabId":747477756,"title":"Inbox — FitBrief","url":"http://localhost:3000/inbox"},{"tabId":747477778,"title":"Profile — FitBrief","url":"http://localhost:3000/profile"}],"tabGroupId":345597083}


Tab Context:
- Available tabs:
  • tabId 747477677: "AI Shadow Shopping Report: Skincare — PerformKit" (http://localhost:8765/research/skincare-2026/)
  • tabId 747477517: "DataForSEO" (https://app.dataforseo.com/users/getrows)
  • tabId 747477756: "Inbox — FitBrief" (http://localhost:3000/inbox)
  • tabId 747477778: "Profile — FitBrief" (http://localhost:3000/profile)
mcp__claude-in-chrome__tabs_create_mcp Tool Use L33
{}
Tool Result L34
Created new tab. Tab ID: 747477863


Tab Context:
- Executed on tabId: 747477863
- Available tabs:
  • tabId 747477677: "AI Shadow Shopping Report: Skincare — PerformKit" (http://localhost:8765/research/skincare-2026/)
  • tabId 747477517: "DataForSEO" (https://app.dataforseo.com/users/getrows)
  • tabId 747477756: "Inbox — FitBrief" (http://localhost:3000/inbox)
  • tabId 747477778: "Profile — FitBrief" (http://localhost:3000/profile)
  • tabId 747477863: "New tab" ()
mcp__claude-in-chrome__navigate Tool Use L35
{
  "url": "https://dashboard.stripe.com/register",
  "tabId": 747477863
}
Tool Result L36
This site is not allowed due to safety restrictions.
mcp__claude-in-chrome__navigate Tool Use L37
{
  "url": "https://stripe.com",
  "tabId": 747477863
}
Tool Result L38
This site is not allowed due to safety restrictions.
Agent L39
The browser automation tool is blocking navigation to Stripe's domain (safety restrictions on financial sites). I can't create the account for you through the browser.

Here's exactly what you need to do — it takes about 2 minutes:

### Step 1: Create the account
1. Go to **https://dashboard.stripe.com/register**
2. Fill in your **email**, **full name**, and **country**
3. Set a **password**
4. Click **Create account**
5. **Verify your email** by clicking the link Stripe sends you

### Step 2: Get your test API key
1. Once logged in, look at the top of the dashboard — make sure the **"Test mode"** toggle is ON (it should be by default for new accounts)
2. Go to **https://dashboard.stripe.com/test/apikeys**
3. You'll see two keys:
   - **Publishable key** (`pk_test_...`) — safe for frontend code
   - **Secret key** (`sk_test_...`) — click "Reveal test key" to see it; this is what you'll use for API calls

### Step 3: Save the key locally
Once you have the secret key, come back and give me the `sk_test_...` value (or just confirm you have it). I'll store it in a `.env` file in this project so we can start making test API calls.

**You do NOT need to activate your account or provide business details** to use test mode. The test keys work immediately.

Let me know when you have the key ready.
Operator L40
I have the secret key
Agent L41

Save it in a `.env` file so we can use it for API calls. What's the `sk_test_...` value?

(It's safe to share test keys — they can't move real money. But I'll keep it local in `.env` and won't commit it.)
Operator L42
sk_test_[REDACTED]
Write Tool Use L43
{
  "file_path": "~/dev/audits/stripe-2026-03-10/.env",
  "content": "STRIPE_SECRET_KEY=sk_test_[REDACTED]\n"
}
Tool Result L44
File created successfully at: ~/dev/audits/stripe-2026-03-10/.env
Agent L45
Let me verify the key works with a quick test API call.
Bash Tool Use L46
{
  "command": "curl -s https://api.stripe.com/v1/payment_methods -u \"sk_test_[REDACTED]:\" -d type=card -d \"card[number]=4242424242424242\" -d \"card[exp_month]=12\" -d \"card[exp_year]=2034\" -d \"card[cvc]=123\" -G -X GET 2>&1 | head -5",
  "description": "Test Stripe API key with a simple list call",
  "dangerouslyDisableSandbox": true
}
Tool Result L47
{
  "error": {
    "code": "parameter_unknown",
    "doc_url": "https://stripe.com/docs/error-codes/parameter-unknown",
    "message": "Received unknown parameter: card",
Bash Tool Use L48
{
  "command": "curl -s https://api.stripe.com/v1/balance -u \"sk_test_[REDACTED]:\"",
  "description": "Test Stripe API key by fetching account balance",
  "dangerouslyDisableSandbox": true
}
Tool Result L49
{
  "object": "balance",
  "available": [
    {
      "amount": 96465,
      "currency": "usd",
      "source_types": {
        "card": 96465
      }
    },
    {
      "amount": 0,
      "currency": "eur",
      "source_types": {
        "card": 0
      }
    }
  ],
  "livemode": false,
  "pending": [
    {
      "amount": 0,
      "currency": "usd",
      "source_types": {
        "card": 0
      }
    },
    {
      "amount": 0,
      "currency": "eur",
      "source_types": {
        "card": 0
      }
    }
  ],
  "refund_and_dispute_prefunding": {
    "available": [
      {
        "amount": 0,
        "currency": "usd"
      },
      {
        "amount": 0,
        "currency": "eur"
      }
    ],
    "pending": [
      {
        "amount": 0,
        "currency": "usd"
      },
      {
        "amount": 0,
        "currency": "eur"
      }
    ]
  }
}
Agent L50
Key is working. The API returned your test balance successfully (`"livemode": false` confirms we're in test mode).

**Setup complete:**
- API key saved to `.env`
- Test mode confirmed — ready to make API calls
Agent L52
No response requested.
Task 3

Core task

Operator L53
Using the Stripe test mode API key, complete this workflow:
>
1. Create a customer with the name "Test User" and email "test@example.com"
2. Create a product called "Usability Audit" priced at $99 (one-time, not recurring)
3. Create a Payment Intent for that amount, attached to the customer
4. Confirm the Payment Intent using a test card number
5. Verify the payment shows as succeeded
>
Use only the Stripe API. Show me the API calls you make and the responses you get. After each step, verify it succeeded before moving to the next — show me the evidence (e.g. the API response confirming creation/status).
Agent L54
Let me work through this step by step using the Stripe API.
Agent L55
### Step 1: Create a Customer
Bash Tool Use L56
{
  "command": "curl -s https://api.stripe.com/v1/customers \\\n  -u \"sk_test_[REDACTED]:\" \\\n  -d name=\"Test User\" \\\n  -d email=\"test@example.com\"",
  "description": "Create a Stripe customer",
  "dangerouslyDisableSandbox": true
}
Tool Result L57
{
  "id": "cus_U7dlwcT5OzY9d5",
  "object": "customer",
  "address": null,
  "balance": 0,
  "created": 1773142198,
  "currency": null,
  "customer_account": null,
  "default_currency": null,
  "default_source": null,
  "delinquent": false,
  "description": null,
  "discount": null,
  "email": "test@example.com",
  "invoice_prefix": "L87ISLWW",
  "invoice_settings": {
    "custom_fields": null,
    "default_payment_method": null,
    "footer": null,
    "rendering_options": null
  },
  "livemode": false,
  "metadata": {},
  "name": "Test User",
  "next_invoice_sequence": 1,
  "phone": null,
  "preferred_locales": [],
  "shipping": null,
  "sources": {
    "object": "list",
    "data": [],
    "has_more": false,
    "total_count": 0,
    "url": "/v1/customers/cus_U7dlwcT5OzY9d5/sources"
  },
  "subscriptions": {
    "object": "list",
    "data": [],
    "has_more": false,
    "total_count": 0,
    "url": "/v1/customers/cus_U7dlwcT5OzY9d5/subscriptions"
  },
  "tax_exempt": "none",
  "tax_ids": {
    "object": "list",
    "data": [],
    "has_more": false,
    "total_count": 0,
    "url": "/v1/customers/cus_U7dlwcT5OzY9d5/tax_ids"
  },
  "test_clock": null
}
Agent L58
Customer created: `cus_U7dlwcT5OzY9d5`, name "Test User", email "test@example.com".

### Step 2: Create a Product and Price
Bash Tool Use L59
{
  "command": "curl -s https://api.stripe.com/v1/products \\\n  -u \"sk_test_[REDACTED]:\" \\\n  -d name=\"Usability Audit\"",
  "description": "Create a Stripe product",
  "dangerouslyDisableSandbox": true
}
Tool Result L60
{
  "id": "prod_U7dlsUY8vt0FHx",
  "object": "product",
  "active": true,
  "attributes": [],
  "created": 1773142202,
  "default_price": null,
  "description": null,
  "features": [],
  "images": [],
  "livemode": false,
  "marketing_features": [],
  "metadata": {},
  "name": "Usability Audit",
  "package_dimensions": null,
  "shippable": null,
  "statement_descriptor": null,
  "tax_code": null,
  "type": "service",
  "unit_label": null,
  "updated": 1773142202,
  "url": null
}
Agent L61
Product created: `prod_U7dlsUY8vt0FHx`. Now create a one-time price of $99.
Bash Tool Use L62
{
  "command": "curl -s https://api.stripe.com/v1/prices \\\n  -u \"sk_test_[REDACTED]:\" \\\n  -d product=\"prod_U7dlsUY8vt0FHx\" \\\n  -d unit_amount=9900 \\\n  -d currency=usd",
  "description": "Create a one-time price of $99",
  "dangerouslyDisableSandbox": true
}
Tool Result L63
{
  "id": "price_1T9OUFLSFkr2JHffEBX0pYEI",
  "object": "price",
  "active": true,
  "billing_scheme": "per_unit",
  "created": 1773142207,
  "currency": "usd",
  "custom_unit_amount": null,
  "livemode": false,
  "lookup_key": null,
  "metadata": {},
  "nickname": null,
  "product": "prod_U7dlsUY8vt0FHx",
  "recurring": null,
  "tax_behavior": "unspecified",
  "tiers_mode": null,
  "transform_quantity": null,
  "type": "one_time",
  "unit_amount": 9900,
  "unit_amount_decimal": "9900"
}
Agent L64
Price created: `price_1T9OUFLSFkr2JHff...` — $99.00 one-time (`"recurring": null` confirms it's not a subscription).

### Step 3: Create a Payment Intent
Bash Tool Use L65
{
  "command": "curl -s https://api.stripe.com/v1/payment_intents \\\n  -u \"sk_test_[REDACTED]:\" \\\n  -d amount=9900 \\\n  -d currency=usd \\\n  -d customer=\"cus_U7dlwcT5OzY9d5\" \\\n  -d \"payment_method_types[]\"=card",
  "description": "Create a PaymentIntent for $99 attached to the customer",
  "dangerouslyDisableSandbox": true
}
Tool Result L66
{
  "id": "pi_3T9OUKLSFkr2JHff0WFdaBW2",
  "object": "payment_intent",
  "amount": 9900,
  "amount_capturable": 0,
  "amount_details": {
    "tip": {}
  },
  "amount_received": 0,
  "application": null,
  "application_fee_amount": null,
  "automatic_payment_methods": null,
  "canceled_at": null,
  "cancellation_reason": null,
  "capture_method": "automatic",
  "charges": {
    "object": "list",
    "data": [],
    "has_more": false,
    "total_count": 0,
    "url": "/v1/charges?payment_intent=pi_3T9OUKLSFkr2JHff0WFdaBW2"
  },
  "client_secret": "pi_3T9OUKLSFkr2JHff0WFdaBW2_secret_jZczjLtjrM10vRFGbX3Bc7C71",
  "confirmation_method": "automatic",
  "created": 1773142212,
  "currency": "usd",
  "customer": "cus_U7dlwcT5OzY9d5",
  "customer_account": null,
  "description": null,
  "excluded_payment_method_types": null,
  "invoice": null,
  "last_payment_error": null,
  "latest_charge": null,
  "livemode": false,
  "metadata": {},
  "next_action": null,
  "on_behalf_of": null,
  "payment_method": null,
  "payment_method_configuration_details": null,
  "payment_method_options": {
    "card": {
      "installments": null,
      "mandate_options": null,
      "network": null,
      "request_three_d_secure": "automatic"
    }
  },
  "payment_method_types": [
    "card"
  ],
  "processing": null,
  "receipt_email": null,
  "review": null,
  "setup_future_usage": null,
  "shipping": null,
  "source": null,
  "statement_descriptor": null,
  "statement_descriptor_suffix": null,
  "status": "requires_payment_method",
  "transfer_data": null,
  "transfer_group": null
}
Agent L67
PaymentIntent created: `pi_3T9OUKLSFkr2JHff0WFdaBW2`, status `requires_payment_method`, amount $99.00, linked to customer `cus_U7dlwcT5OzY9d5`.

### Step 4: Confirm with a test card

First, create a PaymentMethod using the test card `4242 4242 4242 4242`, then confirm the PaymentIntent.
Bash Tool Use L68
{
  "command": "curl -s https://api.stripe.com/v1/payment_intents/pi_3T9OUKLSFkr2JHff0WFdaBW2/confirm \\\n  -u \"sk_test_[REDACTED]:\" \\\n  -d payment_method=pm_card_visa",
  "description": "Confirm the PaymentIntent with a test Visa card",
  "dangerouslyDisableSandbox": true
}
Tool Result L69
{
  "id": "pi_3T9OUKLSFkr2JHff0WFdaBW2",
  "object": "payment_intent",
  "amount": 9900,
  "amount_capturable": 0,
  "amount_details": {
    "tip": {}
  },
  "amount_received": 9900,
  "application": null,
  "application_fee_amount": null,
  "automatic_payment_methods": null,
  "canceled_at": null,
  "cancellation_reason": null,
  "capture_method": "automatic",
  "charges": {
    "object": "list",
    "data": [
      {
        "id": "ch_3T9OUKLSFkr2JHff0RmJZjwO",
        "object": "charge",
        "amount": 9900,
        "amount_captured": 9900,
        "amount_refunded": 0,
        "application": null,
        "application_fee": null,
        "application_fee_amount": null,
        "balance_transaction": "txn_3T9OUKLSFkr2JHff0yUQcgno",
        "billing_details": {
          "address": {
            "city": null,
            "country": null,
            "line1": null,
            "line2": null,
            "postal_code": null,
            "state": null
          },
          "email": null,
          "name": null,
          "phone": null,
          "tax_id": null
        },
        "calculated_statement_descriptor": "PMJOBLIST.COM",
        "captured": true,
        "created": 1773142218,
        "currency": "usd",
        "customer": "cus_U7dlwcT5OzY9d5",
        "description": null,
        "destination": null,
        "dispute": null,
        "disputed": false,
        "failure_balance_transaction": null,
        "failure_code": null,
        "failure_message": null,
        "fraud_details": {},
        "invoice": null,
        "livemode": false,
        "metadata": {},
        "on_behalf_of": null,
        "order": null,
        "outcome": {
          "advice_code": null,
          "network_advice_code": null,
          "network_decline_code": null,
          "network_status": "approved_by_network",
          "reason": null,
          "risk_level": "normal",
          "risk_score": 14,
          "seller_message": "Payment complete.",
          "type": "authorized"
        },
        "paid": true,
        "payment_intent": "pi_3T9OUKLSFkr2JHff0WFdaBW2",
        "payment_method": "pm_1T9OUQLSFkr2JHffdmKjjxCD",
        "payment_method_details": {
          "card": {
            "amount_authorized": 9900,
            "authorization_code": "978164",
            "brand": "visa",
            "checks": {
              "address_line1_check": null,
              "address_postal_code_check": null,
              "cvc_check": "pass"
            },
            "country": "US",
            "exp_month": 3,
            "exp_year": 2027,
            "extended_authorization": {
              "status": "disabled"
            },
            "fingerprint": "LYfZCkLjnCpwibDF",
            "funding": "credit",
            "incremental_authorization": {
              "status": "unavailable"
            },
            "installments": null,
            "last4": "4242",
            "mandate": null,
            "multicapture": {
              "status": "unavailable"
            },
            "network": "visa",
            "network_token": {
              "used": false
            },
            "network_transaction_id": "768910290671077",
            "overcapture": {
              "maximum_amount_capturable": 9900,
              "status": "unavailable"
            },
            "regulated_status": "unregulated",
            "three_d_secure": null,
            "wallet": null
          },
          "type": "card"
        },
        "radar_options": {},
        "receipt_email": null,
        "receipt_number": null,
        "receipt_url": "https://pay.stripe.com/receipts/payment/CAcaFwoVYWNjdF8xSERab2tMU0ZrcjJKSGZmKMuBwM0GMgZE7wIm50c6LBYNoiVkeerRMuLQZG98dZdvdmY6oEmu9bUtouDWJabwPv-ScPAzGeY89UIr",
        "refunded": false,
        "refunds": {
          "object": "list",
          "data": [],
          "has_more": false,
          "total_count": 0,
          "url": "/v1/charges/ch_3T9OUKLSFkr2JHff0RmJZjwO/refunds"
        },
        "review": null,
        "shipping": null,
        "source": null,
        "source_transfer": null,
        "statement_descriptor": null,
        "statement_descriptor_suffix": null,
        "status": "succeeded",
        "transfer_data": null,
        "transfer_group": null
      }
    ],
    "has_more": false,
    "total_count": 1,
    "url": "/v1/charges?payment_intent=pi_3T9OUKLSFkr2JHff0WFdaBW2"
  },
  "client_secret": "pi_3T9OUKLSFkr2JHff0WFdaBW2_secret_jZczjLtjrM10vRFGbX3Bc7C71",
  "confirmation_method": "automatic",
  "created": 1773142212,
  "currency": "usd",
  "customer": "cus_U7dlwcT5OzY9d5",
  "customer_account": null,
  "description": null,
  "excluded_payment_method_types": null,
  "invoice": null,
  "last_payment_error": null,
  "latest_charge": "ch_3T9OUKLSFkr2JHff0RmJZjwO",
  "livemode": false,
  "metadata": {},
  "next_action": null,
  "on_behalf_of": null,
  "payment_method": "pm_1T9OUQLSFkr2JHffdmKjjxCD",
  "payment_method_configuration_details": null,
  "payment_method_options": {
    "card": {
      "installments": null,
      "mandate_options": null,
      "network": null,
      "request_three_d_secure": "automatic"
    }
  },
  "payment_method_types": [
    "card"
  ],
  "processing": null,
  "receipt_email": null,
  "review": null,
  "setup_future_usage": null,
  "shipping": null,
  "source": null,
  "statement_descriptor": null,
  "statement_descriptor_suffix": null,
  "status": "succeeded",
  "transfer_data": null,
  "transfer_group": null
}
Agent L70
### Step 5: Verify — Payment Succeeded

The confirmation response already proves success, but here's the evidence from the response:

| Check | Evidence |
|---|---|
| **PaymentIntent status** | `"status": "succeeded"` |
| **Amount received** | `"amount_received": 9900` ($99.00) |
| **Charge status** | `"status": "succeeded"`, `"paid": true`, `"captured": true` |
| **Card used** | Visa ending in `4242` (test card) |
| **Network approval** | `"network_status": "approved_by_network"` |
| **Customer linked** | `"customer": "cus_U7dlwcT5OzY9d5"` |
| **Live mode** | `"livemode": false` (test mode confirmed) |

---

### Summary of the full workflow

| Step | API Call | Object Created |
|---|---|---|
| 1. Customer | `POST /v1/customers` | `cus_U7dlwcT5OzY9d5` |
| 2a. Product | `POST /v1/products` | `prod_U7dlsUY8vt0FHx` |
| 2b. Price | `POST /v1/prices` | `price_1T9OUFLSFkr2JHff...` ($99, one-time) |
| 3. PaymentIntent | `POST /v1/payment_intents` | `pi_3T9OUKLSFkr2JHff0WFdaBW2` |
| 4. Confirm | `POST /v1/payment_intents/{id}/confirm` | Charge `ch_3T9OUKLSFkr2JHff0RmJZjwO` |

Four API calls, one successful $99 test charge. You can see the payment in your Stripe dashboard at the test payments page.
Task 4

Error handling

Operator L72
Using the Stripe test mode API, do the following:
>
1. Attempt to create a Payment Intent with an invalid currency code
2. Attempt to charge a test card that is configured to be declined (find the right test card number from Stripe's docs)
3. Attempt to retrieve a customer that doesn't exist
>
For each error: show me the full error response, explain whether the error message gave you enough information to understand what went wrong, and describe what you would do to recover.
Agent L73

### Error 1: Invalid currency code
Bash Tool Use L74
{
  "command": "curl -s https://api.stripe.com/v1/payment_intents \\\n  -u \"sk_test_[REDACTED]:\" \\\n  -d amount=5000 \\\n  -d currency=zzz \\\n  -d \"payment_method_types[]\"=card",
  "description": "Create PaymentIntent with invalid currency",
  "dangerouslyDisableSandbox": true
}
Tool Result L75
{
  "error": {
    "message": "Invalid currency: zzz. Stripe currently supports these currencies: usd, aed, afn, all, amd, ang, aoa, ars, aud, awg, azn, bam, bbd, bdt, bgn, bhd, bif, bmd, bnd, bob, brl, bsd, bwp, byn, bzd, cad, cdf, chf, clp, cny, cop, crc, cve, czk, djf, dkk, dop, dzd, egp, etb, eur, fjd, fkp, gbp, gel, gip, gmd, gnf, gtq, gyd, hkd, hnl, hrk, htg, huf, idr, ils, inr, isk, jmd, jod, jpy, kes, kgs, khr, kmf, krw, kwd, kyd, kzt, lak, lbp, lkr, lrd, lsl, mad, mdl, mga, mkd, mmk, mnt, mop, mur, mvr, mwk, mxn, myr, mzn, nad, ngn, nio, nok, npr, nzd, omr, pab, pen, pgk, php, pkr, pln, pyg, qar, ron, rsd, rub, rwf, sar, sbd, scr, sek, sgd, shp, sle, sos, srd, std, szl, thb, tjs, tnd, top, try, ttd, twd, tzs, uah, ugx, uyu, uzs, vnd, vuv, wst, xaf, xcd, xcg, xof, xpf, yer, zar, zmw, usdc, btn, ghs, eek, lvl, svc, vef, ltl, sll, mro",
    "param": "currency",
    "request_log_url": "https://dashboard.stripe.com/acct_1HDZokLSFkr2JHff/test/workbench/logs?object=req_oDA7f3cpMOrUqS",
    "type": "invalid_request_error"
  }
}
WebFetch Tool Use L76
{
  "url": "https://docs.stripe.com/testing",
  "prompt": "What are the test card numbers for declined cards? List the specific card numbers that simulate declines (e.g. generic decline, insufficient funds, etc.) with their numbers."
}
Tool Result L77
# Declined Test Cards

The provided documentation does not contain specific test card numbers for declined payments. 

The content mentions that declined test cards exist—stating you can "simulate...Kartenfehler aufgrund von [Ablehnungen]" (card errors due to declines)—but the actual card numbers for various decline scenarios (generic decline, insufficient funds, lost card, etc.) are not included in this excerpt.

To access the complete list of declined test card numbers, you would need to consult the full Stripe testing documentation, as this section appears to focus on successful payment scenarios organized by card brand and country.
WebFetch Tool Use L78
{
  "url": "https://docs.stripe.com/testing#declined-payments",
  "prompt": "List all test card numbers that simulate declined payments. I need the card numbers for generic decline, insufficient funds, lost card, stolen card, expired card, incorrect CVC, and any others listed."
}
Tool Result L79
# Test Card Numbers for Declined Payments

I've reviewed the provided documentation, but it does not contain a comprehensive list of test card numbers that simulate declined payments with specific decline reasons (such as insufficient funds, lost card, stolen card, etc.).

The document mentions that test cards can simulate "Kartenfehler aufgrund von Ablehnungen" (card errors due to declines), but the actual card numbers for these specific decline scenarios are not included in the content you provided.

To access the complete list of declined payment test cards with their specific failure reasons, you would need to consult the full Stripe testing documentation, particularly the sections referenced but not fully shown here, such as the "[Ablehnungen](https://docs.stripe.com/testing.md#declined-payments)" (declined payments) link mentioned in the document.
WebFetch Tool Use L80
{
  "url": "https://docs.stripe.com/testing.md",
  "prompt": "Find and list ALL test card numbers for declined payments. I need the card numbers for generic_decline, insufficient_funds, lost_card, stolen_card, expired_card, incorrect_cvc, processing_error, and any others. Return the card number and its decline code."
}
Tool Result L81
# Declined Payment Test Cards

Based on the provided documentation, I cannot find test card numbers specifically categorized by decline codes (generic_decline, insufficient_funds, lost_card, stolen_card, expired_card, incorrect_cvc, processing_error, etc.).

The document mentions that test cards can simulate "Kartenfehler aufgrund von Ablehnungen" (card errors due to rejections), but it does not provide the actual card numbers associated with specific decline scenarios.

The content only includes:
- Test cards organized by card brand (Visa, Mastercard, American Express, etc.)
- Test cards organized by country/region
- Co-branded card examples
- References to sections about testing declines and fraud prevention, but without the actual card numbers listed

**To access the specific declined payment test card numbers you need, you would need to consult the full Stripe testing documentation**, as the complete tables with decline-specific card numbers appear to be in sections referenced but not fully included in this excerpt.
Agent L82
The docs page isn't rendering the decline card table. I know from Stripe's testing docs that `4000000000000002` is the generic decline card. Let me also try `4000000000009995` (insufficient funds). Let me proceed with the remaining two error tests.

### Error 2: Declined card
Bash Tool Use L83
{
  "command": "curl -s https://api.stripe.com/v1/payment_intents \\\n  -u \"sk_test_[REDACTED]:\" \\\n  -d amount=5000 \\\n  -d currency=usd \\\n  -d \"payment_method_types[]\"=card \\\n  -d confirm=true \\\n  -d \"payment_method_data[type]\"=card \\\n  -d \"payment_method_data[card][number]\"=4000000000000002 \\\n  -d \"payment_method_data[card][exp_month]\"=12 \\\n  -d \"payment_method_data[card][exp_year]\"=2034 \\\n  -d \"payment_method_data[card][cvc]\"=123",
  "description": "Create and confirm PaymentIntent with a decline-test card",
  "dangerouslyDisableSandbox": true
}
Tool Result L84
{
  "error": {
    "message": "Sending credit card numbers directly to the Stripe API is generally unsafe. We suggest you use test tokens that map to the test card you are using, see https://stripe.com/docs/testing. To enable testing raw card data APIs, see https://support.stripe.com/questions/enabling-access-to-raw-card-data-apis.",
    "request_log_url": "https://dashboard.stripe.com/acct_1HDZokLSFkr2JHff/test/workbench/logs?object=req_P8dmFlngxz28Cp",
    "type": "invalid_request_error"
  }
}
Agent L85
Stripe won't accept raw card numbers via the API (security measure). I need to use the test token shorthand instead.
Bash Tool Use L86
{
  "command": "curl -s https://api.stripe.com/v1/payment_intents \\\n  -u \"sk_test_[REDACTED]:\" \\\n  -d amount=5000 \\\n  -d currency=usd \\\n  -d \"payment_method_types[]\"=card \\\n  -d confirm=true \\\n  -d payment_method=pm_card_chargeDeclined",
  "description": "Confirm PaymentIntent with a decline test token",
  "dangerouslyDisableSandbox": true
}
Tool Result L87
{
  "error": {
    "advice_code": "try_again_later",
    "charge": "ch_3T9OgjLSFkr2JHff1a5Kbbng",
    "code": "card_declined",
    "decline_code": "generic_decline",
    "doc_url": "https://stripe.com/docs/error-codes/card-declined",
    "message": "Your card was declined.",
    "network_decline_code": "01",
    "payment_intent": {
      "id": "pi_3T9OgjLSFkr2JHff1Sp0MvuJ",
      "object": "payment_intent",
      "amount": 5000,
      "amount_capturable": 0,
      "amount_details": {
        "tip": {}
      },
      "amount_received": 0,
      "application": null,
      "application_fee_amount": null,
      "automatic_payment_methods": null,
      "canceled_at": null,
      "cancellation_reason": null,
      "capture_method": "automatic",
      "charges": {
        "object": "list",
        "data": [
          {
            "id": "ch_3T9OgjLSFkr2JHff1a5Kbbng",
            "object": "charge",
            "amount": 5000,
            "amount_captured": 0,
            "amount_refunded": 0,
            "application": null,
            "application_fee": null,
            "application_fee_amount": null,
            "balance_transaction": null,
            "billing_details": {
              "address": {
                "city": null,
                "country": null,
                "line1": null,
                "line2": null,
                "postal_code": null,
                "state": null
              },
              "email": null,
              "name": null,
              "phone": null,
              "tax_id": null
            },
            "calculated_statement_descriptor": "PMJOBLIST.COM",
            "captured": false,
            "created": 1773142981,
            "currency": "usd",
            "customer": null,
            "description": null,
            "destination": null,
            "dispute": null,
            "disputed": false,
            "failure_balance_transaction": null,
            "failure_code": "card_declined",
            "failure_message": "Your card was declined.",
            "fraud_details": {},
            "invoice": null,
            "livemode": false,
            "metadata": {},
            "on_behalf_of": null,
            "order": null,
            "outcome": {
              "advice_code": "try_again_later",
              "network_advice_code": null,
              "network_decline_code": "01",
              "network_status": "declined_by_network",
              "reason": "generic_decline",
              "risk_level": "normal",
              "risk_score": 33,
              "seller_message": "The bank did not return any further details with this decline.",
              "type": "issuer_declined"
            },
            "paid": false,
            "payment_intent": "pi_3T9OgjLSFkr2JHff1Sp0MvuJ",
            "payment_method": "pm_1T9OgiLSFkr2JHffHgKipfWV",
            "payment_method_details": {
              "card": {
                "amount_authorized": null,
                "authorization_code": "179873",
                "brand": "visa",
                "checks": {
                  "address_line1_check": null,
                  "address_postal_code_check": null,
                  "cvc_check": "pass"
                },
                "country": "US",
                "exp_month": 3,
                "exp_year": 2027,
                "extended_authorization": {
                  "status": "disabled"
                },
                "fingerprint": "vZ0gr7Ae5Qei8bU6",
                "funding": "credit",
                "incremental_authorization": {
                  "status": "unavailable"
                },
                "installments": null,
                "last4": "0002",
                "mandate": null,
                "multicapture": {
                  "status": "unavailable"
                },
                "network": "visa",
                "network_token": {
                  "used": false
                },
                "network_transaction_id": "118904810311455",
                "overcapture": {
                  "maximum_amount_capturable": 5000,
                  "status": "unavailable"
                },
                "regulated_status": "unregulated",
                "three_d_secure": null,
                "wallet": null
              },
              "type": "card"
            },
            "radar_options": {},
            "receipt_email": null,
            "receipt_number": null,
            "receipt_url": null,
            "refunded": false,
            "refunds": {
              "object": "list",
              "data": [],
              "has_more": false,
              "total_count": 0,
              "url": "/v1/charges/ch_3T9OgjLSFkr2JHff1a5Kbbng/refunds"
            },
            "review": null,
            "shipping": null,
            "source": null,
            "source_transfer": null,
            "statement_descriptor": null,
            "statement_descriptor_suffix": null,
            "status": "failed",
            "transfer_data": null,
            "transfer_group": null
          }
        ],
        "has_more": false,
        "total_count": 1,
        "url": "/v1/charges?payment_intent=pi_3T9OgjLSFkr2JHff1Sp0MvuJ"
      },
      "client_secret": "pi_3T9OgjLSFkr2JHff1Sp0MvuJ_secret_QKuUDMndiKMtkxWkiOrbQaLuM",
      "confirmation_method": "automatic",
      "created": 1773142981,
      "currency": "usd",
      "customer": null,
      "customer_account": null,
      "description": null,
      "excluded_payment_method_types": null,
      "invoice": null,
      "last_payment_error": {
        "advice_code": "try_again_later",
        "charge": "ch_3T9OgjLSFkr2JHff1a5Kbbng",
        "code": "card_declined",
        "decline_code": "generic_decline",
        "doc_url": "https://stripe.com/docs/error-codes/card-declined",
        "message": "Your card was declined.",
        "network_decline_code": "01",
        "payment_method": {
          "id": "pm_1T9OgiLSFkr2JHffHgKipfWV",
          "object": "payment_method",
          "allow_redisplay": "unspecified",
          "billing_details": {
            "address": {
              "city": null,
              "country": null,
              "line1": null,
              "line2": null,
              "postal_code": null,
              "state": null
            },
            "email": null,
            "name": null,
            "phone": null,
            "tax_id": null
          },
          "card": {
            "brand": "visa",
            "checks": {
              "address_line1_check": null,
              "address_postal_code_check": null,
              "cvc_check": "pass"
            },
            "country": "US",
            "display_brand": "visa",
            "exp_month": 3,
            "exp_year": 2027,
            "fingerprint": "vZ0gr7Ae5Qei8bU6",
            "funding": "credit",
            "generated_from": null,
            "last4": "0002",
            "networks": {
              "available": [
                "visa"
              ],
              "preferred": null
            },
            "regulated_status": "unregulated",
            "three_d_secure_usage": {
              "supported": true
            },
            "wallet": null
          },
          "created": 1773142981,
          "customer": null,
          "customer_account": null,
          "livemode": false,
          "metadata": {},
          "type": "card"
        },
        "type": "card_error"
      },
      "latest_charge": "ch_3T9OgjLSFkr2JHff1a5Kbbng",
      "livemode": false,
      "metadata": {},
      "next_action": null,
      "on_behalf_of": null,
      "payment_method": null,
      "payment_method_configuration_details": null,
      "payment_method_options": {
        "card": {
          "installments": null,
          "mandate_options": null,
          "network": null,
          "request_three_d_secure": "automatic"
        }
      },
      "payment_method_types": [
        "card"
      ],
      "processing": null,
      "receipt_email": null,
      "review": null,
      "setup_future_usage": null,
      "shipping": null,
      "source": null,
      "statement_descriptor": null,
      "statement_descriptor_suffix": null,
      "status": "requires_payment_method",
      "transfer_data": null,
      "transfer_group": null
    },
    "payment_method": {
      "id": "pm_1T9OgiLSFkr2JHffHgKipfWV",
      "object": "payment_method",
      "allow_redisplay": "unspecified",
      "billing_details": {
        "address": {
          "city": null,
          "country": null,
          "line1": null,
          "line2": null,
          "postal_code": null,
          "state": null
        },
        "email": null,
        "name": null,
        "phone": null,
        "tax_id": null
      },
      "card": {
        "brand": "visa",
        "checks": {
          "address_line1_check": null,
          "address_postal_code_check": null,
          "cvc_check": "pass"
        },
        "country": "US",
        "display_brand": "visa",
        "exp_month": 3,
        "exp_year": 2027,
        "fingerprint": "vZ0gr7Ae5Qei8bU6",
        "funding": "credit",
        "generated_from": null,
        "last4": "0002",
        "networks": {
          "available": [
            "visa"
          ],
          "preferred": null
        },
        "regulated_status": "unregulated",
        "three_d_secure_usage": {
          "supported": true
        },
        "wallet": null
      },
      "created": 1773142981,
      "customer": null,
      "customer_account": null,
      "livemode": false,
      "metadata": {},
      "type": "card"
    },
    "request_log_url": "https://dashboard.stripe.com/acct_1HDZokLSFkr2JHff/test/workbench/logs?object=req_S3npR1PSeyQuza",
    "type": "card_error"
  }
}
Agent L88
### Error 3: Non-existent customer
Bash Tool Use L89
{
  "command": "curl -s https://api.stripe.com/v1/customers/cus_DOESNOTEXIST999 \\\n  -u \"sk_test_[REDACTED]:\"",
  "description": "Retrieve a non-existent customer",
  "dangerouslyDisableSandbox": true
}
Tool Result L90
{
  "error": {
    "code": "resource_missing",
    "doc_url": "https://stripe.com/docs/error-codes/resource-missing",
    "message": "No such customer: 'cus_DOESNOTEXIST999'",
    "param": "id",
    "request_log_url": "https://dashboard.stripe.com/acct_1HDZokLSFkr2JHff/test/workbench/logs?object=req_XOrDpGoEkFYiN3",
    "type": "invalid_request_error"
  }
}
Agent L91
All three done. Here's the analysis:

---

## Error 1: Invalid Currency (`zzz`)

**Error type:** `invalid_request_error`
**Message:** `Invalid currency: zzz. Stripe currently supports these currencies: usd, aed, afn, all, ...`

**Diagnostic quality:** Excellent. Stripe tells you exactly what's wrong (`param: "currency"`), names the bad value, and lists every valid currency. You also get a `request_log_url` linking directly to the failed request in your dashboard.

**Recovery:** Fix the currency code to a valid ISO 4217 value (e.g. `usd`). This is a pure input validation error — nothing to retry, just correct the parameter.

---

## Error 2: Declined Card (`pm_card_chargeDeclined`)

**Error type:** `card_error`
**Key fields:**
- `code: "card_declined"`
- `decline_code: "generic_decline"`
- `network_decline_code: "01"`
- `advice_code: "try_again_later"`
- `outcome.seller_message: "The bank did not return any further details with this decline."`

**Diagnostic quality:** Very good. Stripe gives you multiple layers of information:
- The high-level `code` tells your code what happened
- The `decline_code` gives a more specific reason
- The `advice_code` suggests what to do next
- The `outcome` object includes the network-level decline code and a human-readable `seller_message`
- The PaymentIntent is returned in full, showing its status flipped to `requires_payment_method` — meaning it's still alive and can be retried

**Recovery:** The PaymentIntent isn't dead. You can call `confirm` again with a different payment method. In a real app, you'd prompt the customer to try a different card. The `advice_code: "try_again_later"` suggests this may also be a transient issue worth retrying.

---

## Error 3: Non-existent Customer

**Error type:** `invalid_request_error`
**Code:** `resource_missing`
**Message:** `No such customer: 'cus_DOESNOTEXIST999'`

**Diagnostic quality:** Clear and sufficient. It names the exact ID that wasn't found and the param (`id`) that caused the error. The `doc_url` links to Stripe's docs on this error code.

**Recovery:** Verify the customer ID is correct. If the customer was deleted or the ID is from a different Stripe account/mode (live vs. test), that would explain the miss. In code, handle this with a try/catch and either create the customer or surface the error to the caller.

---

## Summary

| Error | Type | Diagnosable? | Recoverable? |
|---|---|---|---|
| Invalid currency | `invalid_request_error` | Immediately — lists valid values | Fix the input |
| Declined card | `card_error` | Yes — decline code + advice code | Retry with a different payment method |
| Missing customer | `invalid_request_error` | Yes — names the bad ID | Verify ID or create new customer |

Stripe's error responses are structured consistently: every error includes `type`, `message`, `request_log_url`, and usually `code`, `param`, and `doc_url`. This makes programmatic error handling straightforward — you can branch on `type` and `code` without parsing message strings.
Task 5

Cleanup

Operator L93
Clean up everything we created during this test:
>
1. Delete the test customer
2. Archive or delete the product
3. Confirm no test data remains
>
If any of these can't be done via the API, tell me what manual steps would be needed.
Bash Tool Use L94
{
  "command": "curl -s https://api.stripe.com/v1/customers/cus_U7dlwcT5OzY9d5 -X DELETE \\\n  -u \"sk_test_[REDACTED]:\"",
  "description": "Delete the test customer",
  "dangerouslyDisableSandbox": true
}
Tool Result L95
{
  "id": "cus_U7dlwcT5OzY9d5",
  "object": "customer",
  "deleted": true
}
Bash Tool Use L96
{
  "command": "curl -s https://api.stripe.com/v1/products/prod_U7dlsUY8vt0FHx -X POST \\\n  -u \"sk_test_[REDACTED]:\" \\\n  -d active=false",
  "description": "Archive the product (deactivate it)",
  "dangerouslyDisableSandbox": true
}
Tool Result L97
{
  "id": "prod_U7dlsUY8vt0FHx",
  "object": "product",
  "active": false,
  "attributes": [],
  "created": 1773142202,
  "default_price": null,
  "description": null,
  "features": [],
  "images": [],
  "livemode": false,
  "marketing_features": [],
  "metadata": {},
  "name": "Usability Audit",
  "package_dimensions": null,
  "shippable": null,
  "statement_descriptor": null,
  "tax_code": null,
  "type": "service",
  "unit_label": null,
  "updated": 1773143039,
  "url": null
}
Agent L98
Now let me verify nothing remains.
Bash Tool Use L99
{
  "command": "curl -s \"https://api.stripe.com/v1/customers/cus_U7dlwcT5OzY9d5\" \\\n  -u \"sk_test_[REDACTED]:\"",
  "description": "Verify customer is deleted",
  "dangerouslyDisableSandbox": true
}
Tool Result L100
{
  "id": "cus_U7dlwcT5OzY9d5",
  "object": "customer",
  "deleted": true
}
Bash Tool Use L101
{
  "command": "curl -s \"https://api.stripe.com/v1/products/prod_U7dlsUY8vt0FHx\" \\\n  -u \"sk_test_[REDACTED]:\"",
  "description": "Verify product is archived",
  "dangerouslyDisableSandbox": true
}
Tool Result L102
{
  "id": "prod_U7dlsUY8vt0FHx",
  "object": "product",
  "active": false,
  "attributes": [],
  "created": 1773142202,
  "default_price": null,
  "description": null,
  "features": [],
  "images": [],
  "livemode": false,
  "marketing_features": [],
  "metadata": {},
  "name": "Usability Audit",
  "package_dimensions": null,
  "shippable": null,
  "statement_descriptor": null,
  "tax_code": null,
  "type": "service",
  "unit_label": null,
  "updated": 1773143039,
  "url": null
}
Agent L103
Done. Here's the cleanup summary:

| Object | ID | Action | Status |
|---|---|---|---|
| Customer | `cus_U7dlwcT5OzY9d5` | Deleted | `"deleted": true` |
| Product | `prod_U7dlsUY8vt0FHx` | Archived | `"active": false` |

### What can't be fully deleted via API

- **PaymentIntents and Charges** (`pi_3T9OUK...`, `pi_3T9Ogj...`, `ch_3T9OUK...`, `ch_3T9Ogj...`) — These are **immutable ledger records**. Stripe does not allow deletion of payment history via the API. They remain in your test dashboard but have no operational effect.

- **Price** (`price_1T9OUF...`) — Prices can be deactivated (`active: false`) but not deleted. Since the parent product is already archived, the price is effectively inert.

- **PaymentMethods** (`pm_1T9OUQ...`, `pm_1T9Ogi...`) — These are detached (not saved to any customer) and will not be usable.

If you want a completely clean slate, the nuclear option is: **Stripe Dashboard → Settings → Test Data → "Delete all test data"**. That wipes everything in test mode. But for normal use, what we've done here is sufficient — the customer is gone, the product is archived, and the payment records are just historical artifacts.
Task 6

Reflection

Operator L105
Looking back at everything you just did — discovering Stripe, onboarding, completing the payment workflow, handling errors, and cleaning up:
>
1. Which steps were straightforward and which felt unnecessarily complex?
2. Where did you have to work around something rather than use what felt like the intended path?
3. What would have made this easier?
>
Be specific — refer to actual moments from the tasks above.
Agent L106
The user wants a retrospective on the entire Stripe evaluation experience. Let me reflect honestly on what actually happened across all the tasks.
Agent L107
## Retrospective

### What was straightforward

**The core payment flow was remarkably smooth.** Creating a customer, product, price, PaymentIntent, and confirming it took five sequential `curl` calls with no surprises. The API is consistent — every object comes back with an `id`, you pass that `id` to the next call. The response from confirming the PaymentIntent included the full charge object inline, so I didn't need a separate verification step. That's good API design.

**Error handling was the cleanest part.** All three error scenarios returned structured, actionable responses. The invalid currency error literally listed every valid option. The declined card error gave me a `decline_code`, an `advice_code`, and left the PaymentIntent in `requires_payment_method` status so it could be retried. I didn't have to guess at anything — every error told me what went wrong and what to do about it.

**Cleanup was mostly straightforward.** `DELETE /v1/customers/{id}` just worked. Product archival via `active: false` was a single field update.

---

### Where I had to work around things

**1. The declined card test was a two-attempt detour.** My first instinct was to pass a raw card number (`4000000000000002`) in the `payment_method_data[card][number]` field. Stripe rejected this because raw card numbers aren't allowed through the API without special access — this is a security measure for PCI compliance. I had to switch to using the test token `pm_card_chargeDeclined`. This is the *intended* path, but it wasn't obvious from the PaymentIntent docs that test tokens like `pm_card_chargeDeclined` exist as shortcuts. I found it by knowing the naming convention, not from documentation.

**2. The `llms.txt` file was useful for orientation but the docs pages didn't fully render.** When I tried to look up the specific declined test card numbers from `docs.stripe.com/testing`, the page rendered partially — the decline card table (which is likely dynamically loaded or in a tab) never came through. I tried three different URL variations (`/testing`, `/testing#declined-payments`, `/testing.md`) and none returned the decline card numbers. I had to fall back on knowing that `pm_card_chargeDeclined` exists as a token alias.

**3. Products can't be deleted, only archived.** This isn't a workaround exactly, but it was a moment where the API didn't do what you'd naively expect. Same with PaymentIntents and Charges being immutable. For a test/evaluation workflow where you want a clean slate, having to go to the dashboard UI to wipe test data is a friction point.

---

### What would have made this easier

**A machine-readable test fixtures reference.** The hardest single moment was finding the right declined card token. Stripe has dozens of test tokens (`pm_card_visa`, `pm_card_chargeDeclined`, `pm_card_chargeDeclinedInsufficientFunds`, etc.) but there's no single API endpoint or structured file that lists them. Something like `GET /v1/test_helpers/fixtures` or a JSON file at `docs.stripe.com/test-tokens.json` would have eliminated the guesswork entirely.

**The `llms.txt` file could link to raw-content URLs.** It gave a good high-level map of Stripe's product surface, but when I followed up by fetching actual doc pages, the content was incomplete because the rendered HTML didn't include tabbed/dynamic content. If `llms.txt` linked to `.md` source files that fully rendered (like GitHub raw files), the entire discovery phase would have been one fetch instead of four.

**A `DELETE /v1/test_data` API endpoint.** The dashboard has a "delete all test data" button, but there's no API equivalent. For an automated evaluation workflow — spin up test objects, exercise them, tear everything down — this is a missing piece. You're left with objects you can't delete (PaymentIntents, Charges, Prices) cluttering the test environment.

**Explicit "API-only quickstart" in the docs.** Stripe's onboarding docs lead with the Checkout Sessions flow (hosted UI + webhooks), which is the right default for most users. But for my use case — pure server-side, no frontend, just charge a card — I had to mentally filter out the UI integration parts to find the minimal PaymentIntent-based flow. A dedicated "charge a card from your server with no frontend" guide would have saved orientation time.