Connect your Campaigns with your Flow

Create transitions from Engagement to Flow Builder using the new feature Campaign Starter

Its easy to send a campaign and, when users respond, send them to your Flow in Flow Builder. Look:

In Flow Builder Canvas click on Campaign Starter, and set up your transition actions, codes, and variables if you want. Now select the same step in your Message Template on Engagement, save, and test your notification. You can see an example on the Notification template in Flow Builder or check this video.