Guild Wars 2

I am from China, serial code is not in the website to buy, is a friend gave me, want to ask next this serial code is the original official authorized?
How do I test?
My English level is very poor, if there is the wrong place hope please excuse, thank you.

I was “ASK A QUESTION” has submitted A problem, but the answer did not reply to my QUESTION.

If your friend gave you the code, that he used, I don’t think you can use it again to register. The serial code can only be used once, on one machine (?) – correct me if I’m wrong, please.

Is that what you’re asking?

No, I mean this serial code does not used.
I am in the website bought a, so the problem solved, but thanks for your reply.