The Mail.ru provider combines authentication with OAuth 2.0 authorization. It requires either a Mail.ru Site or a Mail.ru Application (the platform makes distinctions between Sites and Applications) to have been created to use.
Mail.ru Links (Russian):
Complete Example:
<form action="/velruse/mailru/login" method="post">
<input type="submit" value="Login with Mail.ru" />
</form>
Mail.ru Authentication Views
You may see developer docs on http://api.mail.ru/docs/guides/oauth/
Bases: velruse.AuthenticationComplete
MailRu auth complete