one-timecode
nounUK /ˈwʌn taɪm kəʊd/
US /ˈwʌn taɪm koʊd/
A one-time code is a secret number you can use just one time.
The app sent a one-time code to my phone so I could log in.
OTHER MEANINGS
2. A code that expires after a short time, even if unused.
The one-time code expired after five minutes, so I had to request a new one.
3. A unique code used once to unlock a digital purchase or download.
Enter the one-time code on the card to download the game.
4. A code generated for a single transaction to prevent reuse or fraud.
Each payment creates a one-time code that cannot be used again.