Payment Integration Event

Overview

Payment Integration Event is a durable business or technical event exchanged across a payment integration to report that a defined fact or state change occurred. In a payment system, teams should use stable event types and IDs, include object references and timestamps, sign external events, process idempotently, and preserve ordering assumptions. Payment Integration Event is closely connected to Payment API Correlation ID , Payment API Idempotency , and Payment State Recovery .

Its practical purpose is to make responsibilities, trust assumptions, and state ownership explicit at every handoff in a payment system. Each integration should identify the authoritative system for identity, amount, status, settlement, ledger posting, and customer communication. Operationally, the implementation should use stable event types and IDs, include object references and timestamps, sign external events, process idempotently, and preserve ordering assumptions. Testing should include duplicate and out-of-order events, schema drift, provider outage, partial processing, forged callbacks, retries, stale reads, unknown event types, and disagreement between provider and internal state.

Payment Integration Event should remain distinct from Payment API Correlation ID, Payment API Idempotency, and Payment State Recovery, because each can represent a different stage, record, control, or financial outcome.

The principal risks include duplicate, delayed, forged, missing, or out-of-order events and consumers treating notifications as commands without verification. Useful measures include event lag, duplicate rate, schema failures, boundary-related incidents, reconciliation exceptions, and percentage of integrations with documented ownership and contract tests.

Events report facts; commands request action; neither should be interpreted ambiguously. Controls should preserve original payloads, correlation and causation identifiers, delivery attempts, validation results, consumer acknowledgements, and any replay or dead-letter action.