one-time password
nounUK /ˌwʌn taɪm ˈpɑːswɜːd/
US /ˌwʌn taɪm ˈpæswɜːrd/
A secret code you can use only one time to log in.
The bank sent me a one-time password by text message.
OTHER MEANINGS
2. A code sent to your phone to prove it is really you.
Enter the one-time password from your SMS to finish signing in.
3. A password that expires right after it is used.
The app generates a new one-time password every thirty seconds.
4. A short number used once to confirm an online payment.
The store asked for a one-time password before charging my card.