I decided today to buy the pro version because my test period had expired but when i paid i didn't get an activation code. Does anyone know what to do
I don't even find customer support if there is one at all.
Check your spam folder. You should have gotten a mail with everything when you finished it. You can also login with the mycommerce login in mycommerce if you created one. If you do not find it send a mail to email@example.com from the same mail address you used for the purchase along with date/time and time zone of purchase. We always get a list of sold licenses and emails the next day so we can send it then to you to help solving the problem.
Also check here for direct support:
mycommerce is part of digital river.