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Pull Notifications API

REST
Version 1.0 - beta
22 April 2026
Sandbox base URL https://test-api.service.hmrc.gov.uk
Production base URL https://api.service.hmrc.gov.uk

Overview

Use this API to “pull” business event notifications that CDS generates in response to requests submitted using the CDS APIs.

When a declaration is submitted to a CDS API a HTTP status code 202 is returned. As the declaration is processed notifications are generated.

If a callback URL was provided when subscribing to the CDS API the notifications are pushed to that URL.

If a callback URL was not provided when subscribing to the CDS API the notifications are sent to this pull queue.

Pull notifications remain queued for 14 days after which they are deleted from the queue automatically.

You can get all of the notifications for your application, or you can get them for a given conversation. We recommend getting them by conversation.

Note: The number of notification identifiers in the list that is returned by the unpulled and pulled endpoints is limited to 60,000.

Getting notifications for a given conversation

  1. Get a list of unpulled notification identifiers for a given conversation by calling GET /notifications/conversationId/{conversationId}/unpulled

  2. Iterate over this list of notification identifiers and get each unpulled notification from the unpulled queue by calling GET /notifications/unpulled/{notificationId}. When you get a notification from the unpulled queue, it will move to the pulled queue.

  3. To get a notification again after you have retrieved it, get it from the pulled queue by calling GET /notifications/pulled/{notificationId}

Errors

We use standard HTTP status codes to show whether an API request succeeded or not. They are usually in the range:

  • 200 to 299 if it succeeded, including code 202 if it was accepted by an API that needs to wait for further action
  • 400 to 499 if it failed because of a client error by your application
  • 500 to 599 if it failed because of an error on our server

Errors specific to each API are shown in the Endpoints section, under Response. See our reference guide for more on errors.

Testing

You can use the sandbox environment to test this API.

Versioning

When an API changes in a way that is backwards-incompatible, we increase the version number of the API. See our reference guide for more on versioning.



Endpoints

Version Environments Endpoints
Version 1.0 - beta
(opens in new tab)		 Sandbox and Production 1.0 endpoints
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