Wiki source code of Callbacks
                      Last modified by Asbjørn Ulsberg on 2018/07/05 12:48
                  
            | 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. |