Move WP Plugin from Paypal To Hipay - repost

I have a plugin to make request to paypal account and get balance. Now, I want to convert this plugin to work with Hipay instead of Paypal. I know there is API for Hipay. It's a very easy task for someone who have this kind of plugin or who have already worked with Hipay API, ------------- Do you know how to use Hipay API ? ([login to view URL]) It's this plugin that I want to move from paypal to Hipay ([login to view URL]) Thanks,