Using Passwordless Authentication on Android with e-mail

Passwordless functionality should not be embedded in native apps until Auth0 libraries can be updated to properly support it. Until that time, passwordless authentication can still be achieved by using universal login via the web.

With the e-mail connection, the user is requested to enter their e-mail address. Auth0 then sends an email to that address containing a one-time code.

Once the user enters this code into your application, a new user will be created in the email connection. The user is then authenticated by Auth0.

If the e-mail address matches an existing user, Auth0 just authenticates the user:

On mobile platforms, your application will receive an id_token, the user profile and, optionally, a refresh_token.

Setup

Optional: Configure an email provider

By default, Auth0 sends the email from its own messaging provider. Optionally, you can configure your own email provider to better monitor and troubleshoot the email service.

Configure the connection

In the Dashboard, on the Email page, under Connections > Passwordless, you can configure the contents and behavior of the email.

Multi-Language Support

The Message area supports usage of multiple languages.

By making a call to the /passwordless/start authentication endpoint, you can set the value of an 'x-request-language' header to the language of your choice. If the value of this header is not set, the language will be extracted from the value in the 'accept-language' header that is automatically set by the browser.

The Message area accepts Liquid syntax. You can use this syntax, combined with exposed parameter values, to programmatically construct elements of the message. For example, you can reference the request_language parameter to change the language of the message:

{% if request_language contains 'dutch' %}
   Hier is uw verificatie code: {{ code }}
{% endif %}

{% if request_language contains 'fr-FR' %}
   Ceci est votre code: {{ code }}
{% endif %}

The following parameters are available when defining the template:

Exposed Parameter Description
code the password to use
link the magic link
application.name the name of the application name where the user is signing up
request_language the requested language for the message content
operation equals change_email when the template is triggered by an update to a user's email via the API, otherwise null

Implementation

For detailed information on how to implement this, refer to Lock Passwordless for Android documentation.