405 error when trying to merge MR via API

GitLab CI/CD
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1

Problem to solve

I create a merge request from my CI job using the REST API. This works correctly and I get a response containing the MR’s iid.

I then try to use the (PUT) API to set the merge_when_pipeline_succeeds=true flag for this MR. This works when I use my own personal access token, but if I use a project access token (with the same privileges), it fails with a 405 Method not allowed error.

The same token works for creating the merge request and for fetching merge request details.

Steps to reproduce

I followed instructions from Merge requests API | GitLab and made the following request:

curl --header "PRIVATE-TOKEN: glpat-********" -v -X PUT "$CI_API_V4_URL/projects/$CI_PROJECT_ID/merge_requests/$MR_IID/merge?merge_when_pipeline_succeeds=true"

This works when I provide my own PRIVATE_TOKEN but does not work when I provide a project access token.

I’ve verified that the user associated with the project access token does have permissions to merge to the target branch.

Configuration

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2

Hi, any resolution on this? Same exact issue.

3

In my case issue was that pipeline was not yet created when I sent PUT request to merge API, when I added check if pipeline started and then merged a merge request, it worked.