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Looking for somebody to write billing integration for Spree to handle webtopay.com payments. App written to work like Paypal express or Skrill. Main requirements for this app: redirect the buyer from the eshop to make a payment and return him back once the payment is complete for confirmation on placing order. Let the buyer to select a bank from which he is going to make payment(radio buttons) before redirecting him to the payment handling website. Mark payment as complete in Spree admin section.
Spree is an open source e-commerce engine. Documentation can be found in here: http://guides.spreecommerce.com/
webtopay.com is a payment collection system. Full documentation can be found here: https://www.webtopay.com/macro_specification.html
There is plugin written in Ruby for data posts and callbacks from webtopay.com, although not adapted to work with Spree. https://github.com/kristis/webtopay