2. Using an old SDK/executable called pfpro.exe or pfpro_file.exe.
This SDK has not been updated for over 10 years and is deprecated and was replaced with the .NET or Java SDKs available on Github at https://github.com/paypal/payflow-gateway. In the package, you"ll see a command line example under the Samples which is similar to how you were using pfpro.exe, but will require code changes.
For example, for .NET it would be located under “SamplesCS/src/PayPal/Payments/Samples/CS/NameValuePairs/”.
If you have implemented any Access Control List (ACL) or filters on IP addresses, you will need to add all the new IP addresses/ranges before May 1, 2021. Doing so will help avoid failed transactions using the Payflow service."
Thank you to Daniel of PayPal Merchant Technical Services for these solutions.