Documentation Index
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Reference for Atum’s hosted REST APIs — Payment Gateway and x402 Facilitator — and the request_id, authentication, and error conventions those APIs share.
| API | What it does |
|---|---|
| Payment Gateway | The entry point for most integrations: submit signed payments, poll status, resolve by request_id, and open quote-request batches. Also serves x402 corridor defaults. |
| x402 Facilitator | /verify, /settle, and /supported, served by the Payment Gateway under the /x402/v1 prefix. |
sender_auth signature it carries, and read endpoints (/status, /resolve, /timeline) need no credentials.
| Topic | Covers |
|---|---|
| Idempotency | Retrying a write safely by reusing a request_id. |
| Error codes | The IDEMPOTENCY_TERMS_MISMATCH, INVALID_REQUEST_ID, and other codes an HTTP error can carry. |
| Decline reasons | Why a settler said no inside a 200 response. |
POST /v1/payments.