Triggering Jenkins Multibranch pipeline when there is a pull request created in GitHub

I'm using Jenkins Multibranch pipeline. I've configured the APIs(github-webhook and ghprbhook) in GitHub. I want to trigger the Multibranch Pipeline whenever there is a Pull Request on GitHub (without using periodical option). For example, if i create pull request on GitHub, then the Jenkins Multibranch pipeline should start scanning and build the Jenkinsfile automatically. What do i need to do to achieve this? I would love to try if there are any suggestions.