'How to get Pull Requests associated with a Work Item via the Azure DevOps API

I am trying to list all Pull Requests associated with a Work Item but according to the Work Items API there doesn't seem to be a way to get it:

GET https://dev.azure.com/{org}/{project}/_apis/build/builds/123456/workitems?api-version=6.0

The above returns list of work items, such as:

{
  "count": 40,
  "value": [
    {
      "id": "156267",
      "url": "https://dev.azure.com/xxx/_apis/wit/workItems/12345"
    },
    ...
  ]
}

Now, if I still decide to query each returned work item I still don't see a Pull Request. For example:

GET https://dev.azure.com/xxx/_apis/wit/workItems/12345

The above returns a JSON object about updates done to the workitem, but this can be a commit, state update or comments.

Is there a way to get a list of PRs per work item?

Thanks

Solution 1:^[1]

You need to add &$expand=relations:

GET https://dev.azure.com/xxx/_apis/wit/workItems/12345?$expand=relations

Now in the response you will get the linked PR under the relations.

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Solution	Source
Solution 1