Oversimplified example of using Offsite Payments and PxPay

new.html.erb

<%# Example of using OffsitePayments::ActionViewHelper to generate a form %>
<%= payment_service_for 'ORD123456', '[user id]', service: :pxpay, return_url: 'http://localhost:3000/pxpay/return', credential2: '[key]', currency: 'NZD', amount: 12.34 do |service| %>
    <%= submit_tag 'Pay Now' %>
<% end %>

<%# Example of generating a URL directly (see controller) %>
<%= link_to @service.credential_based_url, @service.credential_based_url %>

offsite_payments.rb

# config/initializers/offsite_payments.rb

require 'offsite_payments'

ActionView::Base.send(:include, OffsitePayments::ActionViewHelper)
# OffsitePayments.mode = :test # for testing server

module OffsitePayments::Integrations::Pxpay
  # Use PxPay 2.0
  def self.token_url
    'https://sec.paymentexpress.com/pxaccess/pxpay.aspx'
  end
end

pxpay_controller.rb

class DummyPxpayController < ApplicationController
  layout false

  def new
    # Uses OffsitePayments::Helper directly rather than using the
    # OffsitePayments::ActionViewHelper (see view)
    @service = OffsitePayments::Integrations::Pxpay::Helper.new(
      'ORD123456',
      '[user id]',
      credential2: '[key]',
      amount: 12.34,
      currency: 'NZD',
      return_url: 'http://localhost:3000/pxpay/return'
    )
  end

  def return
    # Example of checking for success (this is the return URL as per #new)
    @notification = OffsitePayments::Integrations::Pxpay.notification(
      request.query_string,
      credential1: '[user id]',
      credential2: '[key]'
    )

    render text: @notification.success? ? 'success' : 'fail'
  end
end

routes.rb

Rails.application.routes.draw do
  get 'pxpay/new' => 'dummy_pxpay#new'
  get 'pxpay/return' => 'dummy_pxpay#return'
end