The Apple App ID is a two part string used to identify one or more apps. Specifically, the Apple App ID is your team ID and bundle ID joined with a period, for example: 1A234H7ABC.com.yourdomain.YourApp.
You or your mobile developer can find your team ID in the your developer account. Sign in to developer.apple.com and click Membership details at the top of the page. Your team ID is listed in your membership details.
Your bundle ID can be found in iTunes Connect. Click on your app and go to App Information. The bundle ID is listed on this page.
Note
- In order to support Universal Links, the Apple App ID needs to be included in your Bitly iOS app configuration. It is used to create an Apple site association file on the custom domain that support Universal Links.