The casio issued to him, as a good customer, a "Fun Card", which when used in the casino earns points for meals and drinks, and enables the casino to track the user's gambling activities.

【翻译】卡西欧公司作为优质客户向他发放了一张“娱乐卡”，此卡在卡西欧赌场使用时可以赚餐饮点数，并使赌场能够跟踪用户的赌博活动。

【分析】issue 是及物动词“发放；发行”，及物动词是必须接宾语的。那么，其宾语是a "Fun Card"。我重新改写一下这个句子：

The casio issued a "Fun Card" to him as a good customer,...

由于a "Fun Card"后面跟了一个非限制性定语从句，所以把它置于状语后面，这样做是为了照应后面的定语从句，让定语从句紧挨着先行词。为了理解，我定语从句再改写一下：

which （= a "Fun Card"）earns points for meals and drinks, and enables the casino to track the user's gambling activities when it is used in the casino.