What SDK do I use for Website Payments Pro UK?
Because Website Payments Pro UK accounts are based on Payflow Pro, UK merchants can use the same SDKs as those used by the US and AU merchants for posting transactions via .NET, Java or via HTTPS (for example, PHP, Perl, Ruby, etc.).
The UK Website Payments Pro uses APIs that aren't compatible with the US Payflow Pro, but the solution is essentially the same. You must integrate both Express Checkout and Direct Payment onto your website.
For more details, see Website Payments Pro integration guide. For a list of SDKs, see PayPal SDKs.