Establish trust and identity
Follow the sender’s documented verification mechanism and determine which event identifiers are available. Treat the event body as untrusted input until it has passed the relevant checks. Keep credentials and verification material out of public code and logs.
Decide which event types the integration accepts and what information it actually needs. Receiving a broad event stream does not mean every field should be stored or every event should trigger a user-visible action.
Expect repetition and delay
Document how the application recognizes an event it has already processed. Consider an event arriving after a later update or after the referenced record was changed locally. The arrival order alone may not be a valid ordering of business decisions.
If processing takes time, record the accepted work durably before acknowledging it according to the provider’s contract. Define retries for processing failures separately from the provider’s retries for delivering the event.
Make failures traceable
Record a correlation between the incoming event, the local record, and the processing result. Provide an operational way to inspect a failed item and decide whether it can be retried safely.
Test an unknown event type, a missing local record, duplicate delivery, and an unavailable dependency. Check that the result is understandable without exposing the entire event payload to every operator.
A webhook endpoint is only the entrance to a workflow. The integration becomes useful when the team can explain how received information changes the application and how an interrupted or incorrect change is repaired.
A practical example.
An external service notifies an application that a payment changed state. The notification might arrive more than once, and an earlier event could be delayed. Before updating the local record, define how to recognize the event and establish whether its information is still applicable.
Keep enough processing history to explain why an event was accepted, ignored, or failed. Separate the receipt of a notification from successful completion of downstream work, and provide a controlled retry path for failures. Use the provider’s documented verification and delivery behavior as the integration contract. Test with repeated events and unavailable dependencies rather than relying solely on the provider’s “send test event” button.
Put it into practice.
- Follow the provider’s documented authenticity checks and delivery semantics.
- Define duplicate, late-event, and failed-processing behavior explicitly.
- Make retries observable and preserve a reference that connects events to business records.