# Wiki source code of Callbacks

Last modified by Asbjørn Ulsberg on 2018/07/05 12:48

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1 | PayEx emits callbacks on all events happening to a payment asynchronously. These callbacks can be used to update the implementers backend systems, send receipts, or any other task related to a change in a payment's status.
2 |
3 | Events like
4 |
5 | * Cancel
6 | * Capture
7 | * Reversal
8 | * Authorize
9 |
10 | = Implementation details =
11 |
12 | The implementer registers the callback-url when posting the payment session. The URL should be unique per payment. The resource contains 4 properties:
13 |
14 | |(% style="text-align:right" %)**Property** |= Description
15 | |(% style="text-align:right" %){{code}}payment{{/code}}|The URL of the affected Payment. Perform a GET request on it to retrieve the Payment status.
16 | |(% style="text-align:right" %){{code}}paymentNumber{{/code}}|The human identifiable number of the Payment, used when talking or writing about the Payment. Only the URL should be used to programmatically identify the Payment.
17 | |(% style="text-align:right" %){{code}}transactiond{{/code}}|The URL of the affected transaction. Perform a GET request on it to retrieve information about the Transaction.
18 | |(% style="text-align:right" %){{code}}transactionNumber{{/code}}|The human identifiable number of the Transaction, used when talking or writing about the Transaction. Only the URL should be used to programmatically identify the Transaction.
19 |
20 | A Credit Card Callback looks like this:
21 |
22 | {{code language="JavaScript"}}
23 | POST scheme://your.defined.host/and-path/for-recieving HTTP/1.1
24 | Content-Type: application/json
25 |
26 | {
27 | "payment": "/psp/creditcard/payments/<paymentId>",
28 | "paymentNumber": 123456,
29 | "transaction": "/psp/creditcard/payments/<paymentId>/transactions/<transactionId>",
30 | "transactionNumber": 12345678
31 | }
32 |
33 | {{/code}}
34 |
35 | >**Note!** It is highly probable that this part of the documentation will get changes in the near future.

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