Paypal Adaptive Payments Library for ActiveMerchant Supports payments, preapprovals, refunds and currency conversions Requirements: .Rails 2.3.x .Json .Builder .ActiveMerchant 1.5.x to install git clone git://github.com/lamp/paypal_adaptive_gateway.git cd /path/to/paypal_adaptive_gateway ./script/install /path/to/active/merchant to use in application_controller.rb def gateway @gateway ||= PaypalAdaptivePaymentGateway.new( :login => 'your_email', :password => 'your_password', :signature => ' your_signature', :appid => 'your_app_id' ) end in the payment process #for chained payments def checkout recipients = [{:email => 'receiver_email', :amount => some_amount, :primary => true}, {:email => 'receiver_email', :amount => recipient_amount, :primary => false} ] response = gateway.pay( :return_url => url_for(:action => 'action', :only_path => false), :cancel_url => url_for(:action => 'action', :only_path => false), :notify_url => url_for(:action => 'notify_action', :only_path => false), :receiver_list => recipients ) redirect_to response.redirect_url_for end set the :primary flag to false for each recipient for a split payment to debug use either gateway.debug or response.debug this gives you the json response, the xml sent and the url it was posted to.