identification number; confirmation number; authentication number
A number used to verify identity, confirm a transaction, or authenticate a user. Common in online services, banking, and official procedures.
Please enter the authentication number when making the payment.
We will send the confirmation number for your reservation by email.
暗証番号 is a personal identification number (PIN) used for security, while 認証番号 is a broader term for any number used for verification or authentication.
確認番号 is a confirmation number, often used for reservations or orders, similar to one use of 認証番号, but 認証番号 can also imply authentication.
Compound of 認証 (authentication, certification) and 番号 (number).