See also http://forum.mikrotik.com/t/user-is-not-activated-after-successful-payment/67172/1
Normis - I cannot give you remote access to a 6.1 system as with it not working, we had to go back to 5.25 very quickly, where it works some of the time. We still get a lot of timed out errors but if the customer creates a new account and tries PayPal again, he is sometimes lucky. 