Does Cscart Support Paypal Through

As an Authorize.Net customer, you can now accept PayPal on your site using PayPal Express Checkout through your payment gateway account. This enhancement allows you to view your PayPal transactions alongside your other Authorize.Net transactions in the Merchant Interface. Accepting PayPal through Authorize.Net is provided with your Authorize.Net account at no additional charge*.

Their web site says you must be using the latest API.