Use this pattern for reliable event ingestion.
1

Verify signature

Validate incoming signature before processing body.
2

Parse and validate payload

Reject malformed JSON and unknown schema versions.
3

Deduplicate events

Use stable event/message IDs as idempotency keys in storage.
4

Acknowledge quickly

Return success quickly and move heavy processing to async worker.
5

Retry safely

Retry transient failures with backoff and dead-letter handling.

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Minimal pseudocode

if !verify_signature(headers, raw_body):
  return 403

event = parse_json(raw_body)
if already_processed(event.id):
  return 200

store_event(event)
enqueue_async_processing(event)
return 200