Welcome to the evil world of Tencent charging. I suggest you leave now. Just run for your life. EA and Ubisoft are like saints compared to Tencent.
If however, you're brave enough to fight the system or clever enough not to fall into their tricks, here is the thing:
ac.qq.com use '动漫点券', roughly 'ac coupons' which can be used only on ac.qq.com. It can be converted from either 'Q币'(coins) or 'Q点’(points). 1 coin=100 coupons. 1 point = 10 coupons.
Q币 is not available for oversea purchase. Q点 is available for USA, UK, Australia, Hong Kong, Macau, Taiwan (According to faq, I don't know how can they limit that). Webpage here:
http://www.pay.qq.com/big5/(Of course in traditional Chinese only)
Plus you get 20% discount if you pay some money to become VIP member of ac.qq.com