Custom Church Apps needs your Apple Team ID in order to create and submit your app to the iTunes App Store.
You can find your Team ID as follows:
1. Open a web browser to https://itunesconnect.apple.com. Login with your Apple account credentials.
2. On the main iTunes Connect page, in the upper-right corner you can find the team name underneath your login name, as shown below:
3. In the Custom Church Apps customer console, in the App Store section you can paste the value into the iTunes Connect Team Name field as shown below: