Hi, I am buying one upgrade for my friend, you seem to be requiring username and password because you will add for them, but since it's a pin or some sort, can't you just tell me the details, because my friend is really "protective" over his account, so hoping you understand, but if you can give a valid reason why you would rather add for them (eg. Jagex checking IPs) then I could tell my friend and maybe he'll tell you his details for you to add.
I'm going first and paying for him