Handle webhook duplicate deliveries safely with idempotency keys

Short summary

Webhook providers use at-least-once delivery, causing events to be processed multiple times due to retries or network failures. Comparing request payloads won't prevent duplicates; use idempotency keys—unique identifiers included in each request—combined with atomic database INSERT ON CONFLICT operations. Retention policies should match your provider's retry window to prevent duplicate business actions.

• •Duplicate webhook delivery causes duplicate orders, payments, and emails if not handled atomically
• •Payload comparison fails because different events can have identical data; use idempotency keys instead
• •Implement with database primary key conflict handling to prevent race conditions under concurrent requests

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