Django-Merchant is a Django app to make using multiple
payment processors easier.

It can talk to the following gateways.

For CreditCard processing. 

1. Authorize.net
2. Paypal
3. Eway

For Off-site processing.

1. Paypal
2. RBS WorldPay
3. Google Checkout
4. Amazon FPS





Links to processors.

https://developer.paypal.com 
http://aws.amazon.com/fps/
https://checkout.google.com/seller/integrate.html
http://developer.authorize.net/
http://www.rbsworldpay.com/support/bg/index.php


PAYPAL REQUIRED SETTINGS
    
    * For Website Payments Pro
        INSTALLED_APPS = (... 'paypal.standard', 'paypal.pro', ...)
        PAYPAL_TEST = True
        PAYPAL_WPP_USER = "???"
        PAYPAL_WPP_PASSWORD = "???"
        PAYPAL_WPP_SIGNATURE = "???"