Authenticator apps

Any app that supports standard 6-digit time-based codes works, for example:

• Google Authenticator (Android, iPhone)
• Microsoft Authenticator
• Authy
• 1Password, Bitwarden and other password managers with a code feature

If codes are rejected

The most common cause is the phone's clock. Codes depend on the time, so set the phone to automatic date and time. CartWhizz accepts the code shown just before or just after the current one, to allow for small differences.