PayPal Payments Pro

PayPal Payments Pro, also referred to as Website Payments Pro sometimes, is the Merchant Gateway Solution offering from PayPal. It allows you to process payments direct from clients credit/debit cards to your PayPal account without the customer ever leaving your site.

Configuration

To activate the module, begin by going to Setup > Payment Gateways and choosing "PayPal Website Payments Pro" from the available list of gateways to activate.

Once it's been added, you will then be asked for your API Username, Password & Signature. These are obtained inside your PayPal account and we have a guide showing exactly how to do this @ http://wiki.whmcs.com/PayPal#Automated_Refunds

3D Secure

The next 3 fields: Processor ID, Merchant ID & Transaction PW are used by the 3D Secure process. PayPal Pro Accounts are usually enrolled for this by default these days and if you have been enrolled, PayPal will have provided you with the details for it.

If they haven't or you don't want to use the 3D Secure feature, then simply leaving these fields blank in WHMCS will mean the 3D Secure process is not used during the checkout process on your site.

Declined Payments

If you experience an error whilst processing payments navigate to Billing > Gateway Log and the full response from PayPal is displayed in the debug field. Refer to the L_ERRORCODE0 value, the following two values will then briefly explain the error.

More detailed descriptions of the errors and instructions for correcting them can be found at https://cms.paypal.com/uk/cgi-bin/?cmd=_render-content&content_ID=developer/e_howto_api_nvp_errorcodes