Stripe Payments Complete Guide

# Stripe Payments Complete Guide for Google Antigravity

Master payment processing with Stripe in Google Antigravity IDE.

## Configuration

```typescript
// .antigravity/stripe.ts
export const stripeConfig = {
  features: { checkout: true, subscriptions: true, webhooks: true }
};
```

## Checkout Session

```typescript
import Stripe from "stripe";
const stripe = new Stripe(process.env.STRIPE_SECRET_KEY!);

export async function createCheckoutSession(priceId: string, customerId: string) {
  return stripe.checkout.sessions.create({
    customer: customerId,
    mode: "subscription",
    line_items: [{ price: priceId, quantity: 1 }],
    success_url: `${process.env.APP_URL}/success`,
    cancel_url: `${process.env.APP_URL}/cancel`
  });
}
```

## Webhook Handler

```typescript
export async function POST(request: Request) {
  const body = await request.text();
  const sig = request.headers.get("stripe-signature")!;
  
  const event = stripe.webhooks.constructEvent(
    body, sig, process.env.STRIPE_WEBHOOK_SECRET!
  );

  if (event.type === "checkout.session.completed") {
    await handleCheckoutComplete(event.data.object);
  }

  return new Response("OK");
}
```

## Best Practices

1. **Validate webhooks**
2. **Use idempotency keys**
3. **Store customer IDs**

Google Antigravity IDE provides Stripe scaffolding.