If you'd like to use Payflow Pro as your payment processor, here is how you can seamlessly link it to your account.
Note: There is a 1% custom processor fee to use this processor.
1. Select Payment Processor from your main menu.
2. Select Add Your Own Custom Processor Here.
3. Select Credit Card and PayPal Payflow Pro from the dropdown menus.
Enter the payment processor credentials from Payflow.
User - If you set up one or more additional users on the account, this value is the ID of the user authorized to process transactions. If, however, you have not set up additional users,
USER has the same value as
VENDOR (case sensitive)
Password - The password you defined while registering for the account (case sensitive)
Vendor - Your merchant login ID was created when you registered for the account
PayPal or the ID provided to you by the authorized PayPal reseller who registered you for the processor (case sensitive)
More detail available here.