An App ID is a two-part string used to identify one or more apps from a single development team.
The string consists of a Team ID and a bundle ID search string, with a period (.) separating the two parts. The Team ID is supplied by Apple and is unique to a specific development team, while the bundle ID search string is supplied by you to match either the bundle ID of a single app or a set of bundle IDs for a group of your apps.
There are two types of App IDs: a wildcard App ID, used for a set of apps, and an explicit App ID, used for a single app.
A wildcard App ID contains an asterisk as the last part of its bundle ID search string. The asterisk replaces some or all of the bundle ID in the search string. The asterisk is treated as a wildcard when matching the bundle ID search string with bundle IDs. For a wildcard App ID to match a set of apps, the bundle ID must exactly match all of the characters preceding the asterisk in the bundle ID search string. The asterisk matches all remaining characters in the bundle ID. The asterisk must match at least one character in the bundle ID.
An explicit App ID contains the full path of a bundle ID and exactly matches a single app.