OmniAuth ParallelMarkets
This gem contains the Parallel Markets strategy for OmniAuth.
ParallelMarkets uses the OAuth2 flow, you can read about at docs.parallelmarkets.com/api.
How To Use It
So let's say you're using Rails, you need to add the strategy to your Gemfile:
gem 'omniauth-parallelmarkets'
Once these are in, you need to add the following to your config/initializers/omniauth.rb:
Rails.application.config.middleware.use OmniAuth::Builder do
You will obviously have to put in your key and secret, which you get when you register your app with Parallel Markets.
Now just follow the README at: https://github.com/intridea/omniauth