Authorise for Invoice Payment

The API endpoint to authorise the payment is POST /Smart/Transaction/STX_xxx/prepare/invoice. This includes a check whether a payment on account is possible in the particlular situation.

POST /api/v2/Smart/Transactions/STX_33PXAW2YN2NJTPM5KPGMK7QF5PBVA2/prepare/invoice HTTP/1.1
Authorization: Bearer qb56tjj1bcvo9n2nj4u38k84lo
Accept: application/json

If everthing is fine, the API responds with 200 OK, and the Smart Transaction changes to status approved:

HTTP/1.1 200 OK
Content-Type: application/json
"object": "smart.transactions",
// ...
"transactions": [
"object": "payment.transactions",
"created": "2020-03-27T10:55:23+01:00",
"updated": "2020-03-27T10:56:12+01:00",
"status": "approved",
// ...

Status approved means the payment is authorised and you should be able to capture it. Status failed means you must repeat the payment process. You must also repeat the payment process when you update the Smart Transaction. It is then set back to created.

If auto_capture is enabled, it would capture the payment automatically. Status ok, received or collection means you can deliver. Status pending means you have to wait for one of these statusses. Status failed means the payment failed, and you must repeat the payment process.