C# Integrate 4 Payment Gateways: Google, PayPal, MoneyBookers

Hello, I have a C# asp.net 3.5 web application. Much of the code is similar to [login to view URL] and I use the SubSonic ORM. Currently I need 4 payment gateways implemented into my solution: 1. PayPal 2. PayPal Pro 3. Google Checkout 4. MoneyBookers However, I will later add Moneris, [login to view URL], and many more. I'm only looking for a developer that has created this code before. Please show me example links in your bid. I need a very **clean** solution for dealing with multiple payment gateways, as I may have 5. Please give me your recommendations in your bid. Currently I have these 3 folders setup for **IPN listeners**: /Website Folder/Gateway/google/ /Website Folder/Gateway/paypal/ /Website Folder/Gateway/moneybookers/ Class Library: each class should hold the logic for (payment redirect/form post url, refunds, saving IPN variables, updating the Order with data from IPN) /BusinessLogic/PaymentGateways/[login to view URL] /BusinessLogic/PaymentGateways/[login to view URL] /BusinessLogic/PaymentGateways/[login to view URL] /BusinessLogic/PaymentGateways/[login to view URL] **Notes:** * No variables can be stored in the [login to view URL] * I have a class called SiteSettings for retrieving variables from the database. * Please create the "sandbox" buyer/seller accounts for testing ## Deliverables Here's is my current demo site: [login to view URL] Add some products to your cart & then view the shopping cart page. You will see that I have the 3 payment gateways listed there. If the user selected google, paypal standard, or money bookers: 1. the will check the corresponding radio button 2. click checkout 3. your logic will generate that form that includes the shopping cart contents 4. the form will be hidden and auto post to the payment gateway's payment page This is how DashCommerce work for paypal standard. I perfer this method because all the **code** is in the logic **classes** and **not** on the shopping cart aspx file.