I've just been through this same issue myself if it helps here's a step by step of how you get the info needed.
1 once logged into papal go to your profile
2. Under Account Information Click on request API Credentials
3. This is the different bit look at option 2 which is Payflo Pro and click on Set up Payflow Pro API access
4. Click Create Access
Now you will see all the options you require.
The UK version of Paypal Website Payments Pro uses what was the old verisign Payflo accounts so no API.
Hope this helps all other fellow UK users