do u have a steam account? if yes, key in the activation code given into your steam client. if not, install steam client first

Done! 
I've got the invoice number via email, but where's the product code?

yep gmail.
the VAT no is it?

you all first time order ka?? look for the steam activation code and key in in steam..

wth what bank did u use? mine was charged RM82.86 lol

btw, if u use gmail, the product activation code will be sent into promotion tab rather than your normal inbox tab.

eh?? what..I playing long time dy.. 

just activate your game in steam under the Games menu..

M2U. Lol but now my friend purchase,after make payment,the website will refresh and show the order and invoice number and can print receipt. He didn't show anything, just show thanks for your order and until now no receive confirmation email. Check all box,inbox, junk,spam don't have. 😱😱