![]() also has SMS, Voice and email channels to support fallback or user choice.manages passcode generation and checking for you. ![]() We recommend using the Authy API to implement TOTP in your application because it: How to implement TOTP 2FA in your application This is how the account and the authenticator app sync the secret key. We recommend scanning a QR code, but you can also enter the key manually. Here's a look at how the Authy Application prompts a user to add a new account. This is a great option for users that may have unstable cellular connections for receiving SMS 2FA or for users who want a more secure channel than SMS 2FA. Because the inputs are available offline, the whole method works offline. Those get put through a one-way function that creates a truncated, readable token. Inputs to the TOTP algorithm include a secret key and your system time.
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