Callback

When a change or update from the back-end system are made on a payment or transaction, Swedbank Pay will perform a callback to inform the payee (merchant) about this update.

Why Is The Callback Important?

Providing a callbackUrl in POST requests is mandatory. Below we provide three example scenarios of why this is important:

1. If the payer closes the payment window, the merchant will never know what happened to the payment if callbackUrl is not implemented.
2. If the payer stops up in a payment app such as Vipps or Swish, the payer will never come back to the merchant. This means that the merchant won’t know what happened to the payment unless callbackUrl is implemented.
3. If a payer experiences a network error or something else happens that prevents the payer from being redirected from Swedbank Pay back to the merchant website, the callbackUrl is what ensures that you receive the information about what happened with the payment.

Good To Know About Callbacks

• When a change or update from the back-end system is made on a payment or transaction, Swedbank Pay will perform an asynchronous server-to-server callback to inform the payee (merchant) about this update.
• It is important to know that the callback is asynchronous, and not real-time. As we can’t guarantee when you get the callback, there could be a delay between when the payer is returned back to the merchant and when the callback arrives. If the merchant chooses to wait for the callback, the payer might be left at the merchant’s page until the response comes.
• Swedbank Pay will make an HTTP POST to the callbackUrl that was specified when the payee (merchant) created the payment.
• When the callbackUrl receives such a callback, an HTTP GET request must be made on the payment or on the transaction. The retrieved payment or transaction resource will give you the necessary information about the recent change/update.
• For unscheduled and recur transactions, no callback will be given for card transactions, only Trustly.
• As it isn’t scaled to be a primary source of updates, no given response time can be guaranteed, and a callback might fail. It will be retried if that should happen. Below are the retry timings, in seconds from the initial transaction time:
  • 30 seconds
  • 60 seconds
  • 360 seconds
  • 432 seconds
  • 864 seconds
  • 1265 seconds
• A callback should return a 200 OK response.

The callback is sent from either 51.107.183.58 or 91.132.170.1 in both the test and production environment.

To understand the nature of the callback, the type of transaction, its status, etc., you need to perform a GET request on the received URL and inspect the response. The transaction type or any other information can not and should not be inferred from the URL. See URL usage for more information.

For paymentOrder implementations (Digital Payments, Checkout v2 and Payment Menu v1), it is critical that you do not use the paymentId or transactionId when performing a GET to retrieve the payment’s status. Use the paymentOrderId.

Callback Example

Payment Method Callback

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{
    "payment": {
        "id": "/psp/invoice/payments/7e6cdfc3-1276-44e9-9992-7cf4419750e1",
        "number": 222222222
    },
    "transaction": {
        "id": "/psp/invoice/payments/7e6cdfc3-1276-44e9-9992-7cf4419750e1/authorizations/ec2a9b09-601a-42ae-8e33-a5737e1cf177",
        "number": 333333333
    }
}

GET Response

When performing an HTTP GET request towards the URL found in the transaction.id field of the callback, the response is going to include the abbreviated example provided below.

The created authorization resource contains information about the authorization transaction made against a invoice payment.

Capture Response

Response

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HTTP/1.1 200 OK
Content-Type: application/json; charset=utf-8; version=3.x/2.0
api-supported-versions: 3.x/2.0

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{
    "paymentorder": "/psp/paymentorders/7e6cdfc3-1276-44e9-9992-7cf4419750e1",
    "authorization": {
        "id": "/psp/paymentorders/7e6cdfc3-1276-44e9-9992-7cf4419750e1/currentpayment/ec2a9b09-601a-42ae-8e33-a5737e1cf177",
        "itemDescriptions": {
            "id": "/psp/paymentorders/7e6cdfc3-1276-44e9-9992-7cf4419750e1/currentpayment/ec2a9b09-601a-42ae-8e33-a5737e1cf177/itemDescriptions"
        },
        "transaction": {
            "id": "/psp/paymentorders/7e6cdfc3-1276-44e9-9992-7cf4419750e1/currentpayment/ec2a9b09-601a-42ae-8e33-a5737e1cf177",
            "created": "2016-09-14T01:01:01.01Z",
            "updated": "2016-09-14T01:01:01.03Z",
            "type": "Authorization",
            "state": "Completed",
            "number": 1234567890,
            "amount": 1000,
            "vatAmount": 250,
            "description": "Test transaction",
            "payeeReference": "ABC123", 
            "receiptReference": "ABC123", 
            "isOperational": false,
            "problem": {
                "type": "https://api.payex.com/psp/errordetail/invoice/3DSECUREERROR",
                "title": "Error when complete authorization",
                "status": 400,
                "detail": "Unable to complete 3DSecure verification!",
                "problems": [
                ] 
            "operations": [
                {
                    "href": "/psp/paymentorders/7e6cdfc3-1276-44e9-9992-7cf4419750e1/currentpayment/ec2a9b09-601a-42ae-8e33-a5737e1cf177",
                    "rel": "edit-authorization",
                    "method": "PATCH"
                }
            ]
        }
    }
}

Sequence Diagram

The sequence diagram below shows the HTTP POST you will receive from Swedbank Pay, and the two GET requests that you make to get the updated status.

sequenceDiagram
    Participant Merchant
    Participant SwedbankPay as Swedbank Pay

    activate SwedbankPay
    SwedbankPay->>+Merchant: POST <callbackUrl>
    deactivate SwedbankPay
    note left of Merchant: Callback by Swedbank Pay
    Merchant-->>+SwedbankPay: HTTP response
    Merchant->>+SwedbankPay: GET invoice payment
    deactivate Merchant
    note left of Merchant: First API request
    SwedbankPay-->>+Merchant: payment resource
    deactivate SwedbankPay