ClickPass tutorial

Hi,

I am trying to use clickpass for my new project so that visitor to my
site could just log in with their existing account credentials.

However, I can’t find any tutorial made for Ruby on Rails. Normally you
can find more than one on any subject related to Ruby on Rails. I find
it very strange. Is no one using it? If you have a link to a tutorial,
please let me know.

Cheers,