Full Answer
Auto-dedupes identical event+email+time within 10 seconds. No manual event_id needed. Use matching timestamps.
Cherry Seed
How does Klaviyo handle event deduplication?
Klaviyo server-side
event tracking API
email marketing data
Quick Answer
Automatic deduplication: same event name + email + timestamp within 10 seconds treated as duplicate. No explicit event_id required (unlike Facebook CAPI). If sending same event from client and server, use identical timestamps. Klaviyo counts event once per unique combination.