Handling duplicate and delayed payment webhooks
How to process payment notifications safely when events arrive more than once or out of order.
Payment providers retry webhooks. Networks delay packets. Your receiver must tolerate the same paid event arriving twice without shipping twice or issuing two download grants.
Store a provider event identifier, ignore duplicates after successful processing, and compare paid amounts to the trusted order total before changing state.
These patterns are also the foundation of the planned Webhook Reliability Kit for Java and Spring Boot developers.