> For the complete documentation index, see [llms.txt](https://doc.ecomm.api.tietoevry.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.ecomm.api.tietoevry.com/api-references/unified-merchant-api/callback-notifications.md).

# Callback notifications

Callback notifications are used to notify merchants about changes to the payment status. The notification is only sent when the Callback URL is configured in the Shop settings.

When callback is received you can call the [get payment information](/api-references/unified-merchant-api/payments.md#get-egw-version-payments-paymentid) endpoint to receive up to date details about the payment. No response body is expected in response to the notifications.

Failure to deliver the notification will trigger retries with an increasing delay - after 1 second, 5 minutes, 1 hour, 1 day, 2 days, 3 days. If all retry attempts are unsuccessful no further requests will be made.

## Callback notification

> Notifies the merchant about payment status changes.

```json
{"openapi":"3.1.0","info":{"title":"E-commerce Gateway Callback API","version":"1.0.0"},"servers":[{"url":"https://hostname"}],"paths":{"/":{"post":{"summary":"Callback notification","description":"Notifies the merchant about payment status changes.","operationId":"callbackNotification","parameters":[{"name":"X-Request-Id","in":"header","description":"ID of the request, unique to the call, as determined by the initiating party","required":true,"schema":{"type":"string","format":"uuid","description":"ID of the request, unique to the call, as determined by the initiating party"}}],"requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/CallbackRequest"}}},"required":true},"responses":{"2XX":{"description":"Notification received.\n\nAny other response code will be treated as a failure and the notification will be retried at a later time.\n"}}}}},"components":{"schemas":{"CallbackRequest":{"type":"object","properties":{"type":{"type":"string","description":"The type of the notification, possible values:\n  * PAYMENT - notification about payment status changes\n","enum":["PAYMENT"]},"paymentId":{"type":"string","description":"Unique ID of the payment","maxLength":64},"paymentStatus":{"type":"string","description":"The new status of the payment","enum":["SENT_FOR_PROCESSING","ABANDONED","AUTHORIZED","CAPTURED","CANCELLED","SETTLED","FAILED","REFUNDED"]}},"required":["type"]}}}}
```


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