Our products supports Paypal DoDirectPayment method among many methods for accepting online real time payments from your site users for the services you offer. This method available for PayPal Premier or Business accounts.
Paypal DoDirectPayment is one of Paypal Website Payments Pro Services. Direct Payment processes credit card transactions with a single API call.
In your admin.cgi -> Billing Manager ->Payment Processor Setup, click on "Paypal Setup", you will get this form:
Paypal DoDirectPayment Settings
As you see above, you need three variables, Your Paypal Username, Password, and Signature. To get these required variables, do the following:
Log in to your PayPal Premier or Business account.
Click the Profile subtab located in the top navigation area.
Click the API Access link under the Account Information header.