Tabby Webhooks API
Register, list, retrieve, update, and remove Tabby webhook endpoints scoped to a merchant_code. Tabby fires authorize, capture, close, reject, expire, refund, and update events as JSON POSTs to your HTTPS endpoint with optional arbitrary auth-header signing. Failed deliveries retry with exponential backoff (1m timeout, up to 4 retries at 1-4 minute intervals).