充值与订阅Top-ups and subscriptions

充值只增加 Q 余额。购买、续费或升级根据服务端报价单独确认。付款状态由支付回调核对，返回网页不代表已付款。A top-up only credits Q. Purchases, renewals and upgrades need a separately confirmed server quote. Provider callbacks determine payment facts; a return page does not prove payment.