WorldPay: How do I issue a refund?
To issue a refund for WorldPay, please follow the instructions found her...
PayPal / Payflow: How To Setup & Process Credit Card Payments
  To get started you will need the following items. These values can be ...
WorldPay / Vantiv: How To Setup & Process Credit Card Payments
Obtain AccountID, AcceptorID, & Token Login to your WorldPay / Va...
Braintree: How To Setup & Process Credit Card Payments
Obtain Public Key & Private Key To find your public key: Log into the p...
CardPointe / CardConnect: How To Setup & Process Credit Card Payments
Obtain Your Username, Password & Merchant ID To configure CardPointe / C...
Authorize.net: How To Setup & Process Credit Card Payments
Once your organization has been approved by Authorize.net, the following...
Stripe: How To Setup & Process Credit Card Payments
Once your organization has been approved by Stripe, the following articl...