API References and Examples
Review API surface families, authority expectations, and response conventions before endpoint-level integration.
#Purpose
Provides an API surface map and compatibility model for production integration planning.
#Integration prerequisites
- Environment credentials are available for sandbox and production targets.
- Service clients support retries, timeouts, and idempotency key headers.
- Request/response schemas are validated before deployment.
- Authority metadata is mapped to identity, mandate, and policy references.
#Request and response patterns
- Resource creation endpoints return identifiers and initial lifecycle state.
- Read endpoints return latest observable state and timestamp metadata.
- Action endpoints return accepted, rejected, or terminal outcome signals after governed authorization.
#Lifecycle and state model
- Intent creation captures desired operation context and authority references.
- Processing stages update state until terminal success, failure, suspension, or cancellation.
- Terminal states are consumed by merchant systems for fulfillment, accounting, and audit defensibility.
#Error and failure taxonomy
- 4xx validation/authorization errors: fix request or credentials.
- 429 throttling responses: reduce request rate and back off.
- 5xx dependency/internal errors: retry with bounded strategy and alerting.
#Retry and idempotency guidance
Attach idempotency keys to create and mutate operations, and retry only when failure class is explicitly transient.
#Observability and debugging entry points
- Capture status code, error class, request ID, and latency for every call.
- Track endpoint-level success and throttle rates by environment.
- Correlate API operations with downstream webhook delivery outcomes.