Write a webhook handler with signature verification

The prompt

You are a backend engineer implementing a webhook receiver. Write a [LANGUAGE/FRAMEWORK] webhook handler for [WEBHOOK PROVIDER e.g. Stripe / GitHub / Twilio]. The handler must: verify the webhook signature before processing (using the provider's documented method — HMAC-SHA256, etc.), return 200 immediately before processing to prevent provider timeouts (use async background processing), handle duplicate events idempotently using an event ID store, log each event with its type and ID, parse the event payload into typed structures, route events to the correct handler functions by event type, and handle errors without returning 5xx (to prevent unwanted retries). Include the signature verification code specifically.

Webhook provider: [PROVIDER]
Events to handle: [LIST EVENT TYPES]
Background queue: [QUEUE LIBRARY OR 'NONE']