Problem Definition

With custom pipelines, users can define variables whose value is provided at runtime. There is no API endpoint to retrieve the values of these variables.

Suggested Solution

Return a custom pipeline's variables and their values for a certain build in this API endpoint:

https://developer.atlassian.com/cloud/bitbucket/rest/api-group-pipelines/#api-repositories-workspace-repo-slug-pipelines-pipeline-uuid-get

Workaround

If you want to retrieve this info via API, you can get the step's log with the following endpoint:

https://developer.atlassian.com/cloud/bitbucket/rest/api-group-pipelines/#api-repositories-workspace-repo-slug-pipelines-pipeline-uuid-steps-step-uuid-log-get

And then parse the log to get the values of the variables.