How to set listener for pull request merged?

[nazreen]

so we can listen to pull_request.closed but that can either be a pull request that was rejected or merged, right? how do I check if the pull request was merged?

[wolfy1339]

Simply check that the payload's pull_request.merged property is true
https://github.com/octokit/webhooks/blob/1c4b64c7d23cadd2406a12a5cf7b8afdf1054246/payload-types/schema.d.ts#L4429-L4447