The Payflow SDK is recommended for .NET and Java developers to simplify the Payflow Pro integration.
You'll find additional examples on GitHub.
How do I use the PHP SDK without command line access to install the package.xml file with Pear?
How do I use Express Checkout with Reference Transactions and Payflow Pro?
How do I use the PayPal API (and PayPal Payments Pro) with the Classic ASP SDK?
How do I use my own checkout pages and successfully maintain PCI compliance with Payflow Pro?
What SDK do I use for Website Payments Pro UK?