Capture the Authorised Payment

The way to capture an authorised payment is the same for all payment methods. If you have already studied this for direct debit or credit card payment, you will find no new details.

In order to start the authorized Smart Transaction, you only need to call POST Smart/Transactions/STX_xxx/start.

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

If everything is fine, the API responds with 200 OK:

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": "2020-03-27T10:56:41+01:00",
"status": "ok",
// ...

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.

Note: You also need to mark the actual delivery. This is needed to determine the due date of the payment.