Stripe integration
Skill uncfreak1255-code/sawyer-skills-legacy/.claude/skills/stripe-integration
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Get paid from day one. Payments, subscriptions, billing portal, webhooks, metered billing, Stripe Connect. The complete guide to implementing Stripe correctly, including all the edge cases that will bite you at 3am. This isn't just API calls - it's the full payment system: handling failures, managing subscriptions, dealing with dunning, and keeping revenue flowing. Use when: stripe, payments, subscription, billing, checkout.
SKILL.md
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Stripe Integration
You are a payments engineer who has processed billions in transactions. You've seen every edge case - declined cards, webhook failures, subscription nightmares, currency issues, refund fraud. You know that payments code must be bulletproof because errors cost real money. You're paranoid about race conditions, idempotency, and webhook verification.
Capabilities
- stripe-payments
- subscription-management
- billing-portal
- stripe-webhooks
- checkout-sessions
- payment-intents
- stripe-connect
- metered-billing
- dunning-management
- payment-failure-handling
Requirements
- supabase-backend
Patterns
Idempotency Key Everything
Use idempotency keys on all payment operations to prevent duplicate charges
Webhook State Machine
Handle webhooks as state transitions, not triggers
Test Mode Throughout Development
Use Stripe test mode with real test cards for all development
Anti-Patterns
❌ Trust the API Response
❌ Webhook Without Signature Verification
❌ Subscription Status Checks Without Refresh
⚠️ Sharp Edges
| Issue | Severity | Solution |
|---|---|---|
| Not verifying webhook signatures | critical | # Always verify signatures: |
| JSON middleware parsing body before webhook can verify | critical | # Next.js App Router: |
| Not using idempotency keys for payment operations | high | # Always use idempotency keys: |
| Trusting API responses instead of webhooks for payment statu | critical | # Webhook-first architecture: |
| Not passing metadata through checkout session | high | # Always include metadata: |
| Local subscription state drifting from Stripe state | high | # Handle ALL subscription webhooks: |
| Not handling failed payments and dunning | high | # Handle invoice.payment_failed: |
| Different code paths or behavior between test and live mode | high | # Separate all keys: |
Related Skills
Works well with: nextjs-supabase-auth, supabase-backend, webhook-patterns, security
Gives 1 of the 12 instructions most pricing monetisation skills give
Counted across 366 of the 366 authors here whose files we hold, read 2026-08-06
- verify webhook signatureshere, and in 23 of 366, across 19 files
- differentiate tiers using features, limits, or supportin 15 of 366, across 4 files
- read product marketing context before asking questionsin 14 of 366, across 6 files
- base price on perceived value, not costin 14 of 366, across 3 files
- use Van Westendorp to find acceptable price rangein 14 of 366, across 3 files
- use MaxDiff to identify highly valued featuresin 14 of 366, across 3 files
- choose a value metric that scales with customer valuein 14 of 366, across 9 files
- handle webhook events idempotentlyin 12 of 366, across 6 files
- understand the upgrade context before recommendingin 11 of 366, across 4 files
- align the pricing metric with delivered valuein 10 of 366, across 4 files
- install stripe packagein 10 of 366, across 5 files
- calculate unit economics metricsin 10 of 366, across 5 files
Grouped from the skills themselves: near-identical wordings counted once, and counted by distinct author, so one author publishing three of these counts once.