Function handleWebhook

handleWebhook(signature: string, payload: Buffer): Promise<string>
Handles a webhook event from Stripe
Parameters
- signature: string
  The Stripe signature header
- payload: Buffer
  The raw request body
Returns Promise<string>
A success message
Throws
Error if webhook verification fails
Example
```
await handleStripeWebhook(signature, rawBody);
```
- Defined in app/backend/src/services/stripe-service.ts:112