I can't reveal any details, but it is not the same method as the New Zealand method what you were saying .
The accounts will automatically renew it's premium membership at the end of the month. So all the accounts have lifetime membership. Mine has continued for seven months already.
If your account ever goes bad within three months, you are eligible for a free replacement of course. As I stated in the original post of this thread.
P.S: Sorry for the bad use of the English language, if I didn't make myself clear enough