Webhook

Handles the full webhook lifecycle for AI agents: sending POST requests with retries and exponential backoff, validating HMAC signatures for Stripe, GitHub, and Slack using timing-safe comparison, and generating realistic test payloads for common events like payment_intent.succeeded or push notifications. The debug tool parses headers, detects providers, checks signature validity and timestamp freshness in one pass. Useful when your agent needs to trigger webhooks to external services, verify incoming webhook authenticity, or simulate webhook scenarios during development without hitting live endpoints.