Letting AI Wire Up APIs You Don't Fully Understand

Integrating an API used to mean reading docs for hours, wiring up auth, handling errors, and cursing webhooks. Today, you paste the docs link into Claude Code or Cursor and say wire this up. The AI handles the boring part. Your job is to provide keys and test.

APIs a vibe coder actually uses

• Stripe — take payments
• Resend or Postmark — send emails
• Supabase — database, auth, storage
• Clerk — user accounts without headaches
• OpenAI or Anthropic — AI features inside your app

I want to send a welcome email when someone signs up.

Use Resend. Follow these steps:
1. Add RESEND_API_KEY to .env.local (I'll fill it in)
2. Install the resend SDK
3. Create a helper at lib/email.ts that exports sendWelcome(email, name)
4. Call it from the existing /api/signup route after the user is created
5. Add a friendly subject and one short paragraph of copy
6. Wrap the send in try/catch so a broken email never blocks signup

Explain at the end where I need to paste my API key.

1. 1Use test mode keys (Stripe, Clerk, etc.) while building
2. 2Trigger the flow end to end with a throwaway email
3. 3Check the provider dashboard — did the email send? Did the charge happen?
4. 4Only switch to live keys after two clean test runs

The big idea: you do not need to deeply understand an API to use it well. Paste the docs, describe the outcome, review the wiring, and test with throwaway data before going live.