Looking for the payment processor the 14-day free trial CPA offers use. That will charge customers full price if they don't respond within 14 days and will recur payments monthly.
I am not sure what CPA you are referring to but I am sure it is not what I was thinking, ie Certified Public Account. If you are looking at a recursive payment option which allows you to set a free trial period, Plimus.com offers that.
CPA (cost per action) affiliate networks like azoogle, neverblueads, copeac etc... They offer free trial products like colon cleansers, green tea pills, etc... They offer a 14-day free trial and if the customer does not call the 1-800-number before the 14 day trial is up they will automatically get billed the full price of the product and reoccuring monthly payments till customers call and cancel.