# File lib/active_merchant/billing/gateways/sallie_mae.rb, line 38
      def purchase(money, creditcard, options = {})
        post = PostData.new
        add_invoice(post, options)
        add_creditcard(post, creditcard)
        add_address(post, creditcard, options)
        add_customer_data(post, options)

        commit(:sale, money, post)
      end