Getting Source Branch & Target Branch in Jenkins when PR is raised

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Dear All,

I have enabled Generic Webhook Trigger in Jenkins for triggering the build when PR is raised. The job is getting triggered successfully when PR is raised, but I have a requirement of merging cod temporarily onto targetBranch before running the job. For this, I have configured "Additional Behaviours" under Source Code Management module by choosing "Merge Before Build".

Here I need to provide $targetBranch for merging the code temporarily.

Can anyone confirm what needs to be done get $targetBranch from GitHub Payload when PR is raised?

The $sourceBranch & $targetBranch variables are getting returned from payload when PR is raised through bitbucket but not through github.

quick help is greatly appreciated.

[github-actions[bot]]

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