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# Two Factor Authentication

### Authentication (2FA)

In this option the user will select the type of 2 factor authentication to be used, there are three options:

##### Auth

This option will send the code to your Authentication app from Google.

> See how to use the authentication API

##### SMS

This option will send the authentication code by SMS.

> See how to use the SMS API

#### E-mail

This option will send the authentication code by SMS.

> See how to use the email sending APIs

### API

In this option you select the API previously created to be used to send the code.

### Code expiration time

Time in following to expire token sent for authentication.