AppLovin has it's own set of feed format specifications separate from Meta, Pinterest, or Snapchat. In order to create an output feed that fits the AppLovin specifications follow the instructions below.
Navigate to the output feed page
Click "New Output Feed"
Choose Applovin from the channel dropdown
Click create and then proceed to add designs to your feed and publish
Once you render your Applovin feed from Marpipe, you just need to copy the feed URL and bring it into your Applovin account. Here's how to upload a feed to a catalog in Applovin.