When you create a Blocks app, your code may require that the user who installs the app on their site also installs specific Wix apps. This is called a Wix App Dependency. For example, your app may require that the site include Wix Stores, or Wix Bookings.
When a user installs a Blocks app with an app dependency, they receive a notification that they need to install one or more apps for the app to be useable.
Important: After adding the dependency, make sure to add the necessary permissions for the APIs you want to use.
Click WixBlocks > App > App Dependencies.
Click + Add Dependencies and select the App that you want to add.
Click the next to the app you want to add.