Posted 05 January 2012, 21:38
Hi,
I assume you refer to PayPal express checkout. I have exactly the same problem. I searched through the net and german and english forums and there are several people with that issue. But I didn't find any solution. Most precise hint was from someone from paypal who looked into a case and found that the API call SetExpressCheckout is done but the subsequent GetExpressCheckout and DoExpressCheckout are not called.
I guess that either the whole API-call-thing in this case doesn't work on a unix/linux server but only on windows (maybe due to some case sensitivity) or there is some stupid setting that is wrong.
As I couldn't find a solution I chose to use paypal standard and that seems to work. Is good enough for me.
Bye
Kreszentia