Outpay Payment API: Read and Reconcile Paid Checkouts

GET /api/v1/payments

Lists payments belonging to the authenticated merchant. It accepts limit (1–100) and an optional status filter: paid, pending, failed, or expired.

curl "$OUTPAY_API_BASE_URL/api/v1/payments?status=paid&limit=25" \
  -H "Authorization: Bearer $OUTPAY_API_KEY"

{
  "data": [
    {
      "id": "pay_9d21f7",
      "checkoutId": "chk_4f21a9c3b7e04d18",
      "status": "paid",
      "amount": "49.99",
      "currency": "USDC",
      "chain": "base",
      "txHash": "0xabc123...",
      "createdAt": "2026-07-15T11:40:00.000Z"
    }
  ]
}

The exact payment projection is owned by the application's payments route. Treat additional fields as additive, and do not assume a field your deployment does not return — see schemas.

Fulfilment rule

Persist your order transition using your own order ID from metadata. Verify the webhook signature, confirm the event refers to the expected checkout, and make the fulfilment update idempotent. A repeated webhook, or a later status read, must never ship the same order twice.

Not implemented

There is no refund endpoint, subscription API, official SDK, or multi-chain payment route in the verified v0.1 surface. Do not document a workaround as if it were a supported feature — see settlement for why refunds are out of scope for the current non-custodial model.

Related documentation

• Payments — API reference — the strict endpoint contract.
• Receive and process webhooks — the recommended fulfilment path.
• Handle an expired checkout — recovering from a late or mismatched transfer.