Thanks for a quick reply. It seems to me strange however, the information on Payflow is on American version of Pay pal. In the british version there is only information on website payment pro.
On the other hand, after I log into my PayPal account in Request API credentials there is Option 2 - Payflow Pro... I can't get it....
BTW. In WHMCs module to Payflow, the name "Merchant Login" is the same as "vendor" in PayPal "Manage Payflow Pro Access"