I develop for a credit card processing application that works with PayFlow Pro (among other processors). One of our customers is seeing a "Unexpected transaction state" result when submitting an authorization to PayFlow Pro.
I've found the result listed in the developer docs here, but it does not provide any information as to the cause or how to fix it. Is there anywhere that I can find more information on this issue? PayPal doesn't seem to provide a way to contact them directly regarding development questions, and just points me here.
It turns out the customer had entered the wrong URL for the PayflowPro gateway. It should be "https://pilot-payflowpro.paypal.com" not "https://pilot-payflowlink.paypal.com".