bitbucket webhook to jenkins with branch name

i have a bitbucket repo that sends webhook to trigger jenkins job.

http://:8080/buildByToken/buildWithParameters?job=webhook_me&token=t i want to send with the webhook the bitbucket branch name, so i search the web for the right way to use Environment variables on bit bucket and i've found this site:

so i've edited the url with an "&branch=$BITBUCKET_BRANCH" at the end, but it won't work.

any ideas what should i do in order to send the webhook with the branch name?

*******EDIT*******

i saw that there is something called Bitbucket event payload. which is a json that contains all of the details about the webhook: https://confluence.atlassian.com/bitbucket/event-payloads-740262817.html

but i can't figure a way how to use it and pull it's data from jenkins.

i think that, this is the way to solve this, but i don't know how to use it.

i've found a way to do it, it works for me. you need to use the bitbucket plugin: Bitbucket Plugin

then inside the job you need to specify the branch that will trigger the job after a push and check the marked checkbox:

then on the bitbucket create a webhook with the following URL: http://:/bitbucket-hook/ Like so:

then push something to this repository and that branch, and there you go! if you try to push to a different branch, the job won't be triiggered