Campaign Kit works with the Payment module. Many payment processor plug-ins are available within Payment but only one can be used at one time. When a user donates, the type of payment processor is stamped into the payment. Changing payment processor is not allowed as payment processors can be different in features and processes.
A payment plug-in advertises its features through methods. One key feature is whether recurring payments are possible through the plug-in.
Payment Processor Setup Page
On installation, Campaign Kit installs a payment processor method.