Finding your application's Apple ID in iTunes Connect

  1. Login into your iTunesConnect account here
  2. Click on the link titled Manage Your Applications
  3. Look for the application that you're trying to find the apple id for, then click on the link App Details for that application.
  4. The page will now list details of your application, next to where is says Apple ID should be a number that looks like "319597415." That is your application's Apple ID.