Is there an elegant way to integrate code performing authentication on other php site into Devise?

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I am developing Rails application, in which I need to authorize users from other site written on PHP.

The APIs of PHP site written by its developer are custom i.e. they are not OmniAuth or similar.

I wonder, if there is elegant way to somehow integrate my code sending/receiving JSON responses to/from PHP site into Devise, so it could work like I am doing authentication of users in usual Devise way from my app.

Thanks.

source: http://stackoverflow.com/questions/11110131/is-there-an-elegant-way-to-integrate-code-performing-authentication-on-other-php
Programming in ruby or rials – ror: programming-in-ruby-or-rials-ror