The free trial membership ones have always worked for me (Hulu, ABCmouse, the credit score ones, etc). But some have been more of a pain to unsubscribe than others. I received the gold for WorldBook but WB refused to cancel my membership via phone. I had to ship back the "free" books at my expense so they would cancel. In that instance paying for gold would have been easier.
Coin dozer has worked also but I am still waiting on fyber to confirm on Game of War.
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Coin dozer has worked also but I am still waiting on fyber to confirm on Game of War.