noun
registration identifier
A computing term for a unique identifier assigned during registration, such as a user ID, device ID, or application registration key.
アプリをインストールすると、登録識別子が自動的に発行されます。
When you install the app, a registration identifier is automatically issued.
この登録識別子は、ユーザーごとに一意です。
This registration identifier is unique for each user.
Compound of 登録 (registration) + 識別子 (identifier). The term is a direct technical translation of the English 'registration identifier'.