Offer sites, with credit card requirement, should I do it or not?

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I have a bit of a problem. I am an international user, which means there are only a few sites that I can use in regards to making money online, ptc is one typ. A type of site that I rarely can use is offer sites, since they normally only allow US users. However, I am a member of Swatcash, and for the first time since I joined (about three months ago) there is an offer I can do. Adding to the story is that if I do that offer I get enough cash through offers to open my next mission, which I really need for other things, so I really, really need it. Anyway, the problem is that the offers require me to put in my credit card details. I do not really want to do that. It is a trial at PokerSavvy for seven days, and it says that if I don't like it I can cancel it during the free trial. However, I am a bit afraid to put my credit card details in. So, what do you think? Is there a way to get around putting credit card details in on those sites. What should I do? Is anyone a member of Poker Savvy and can tell me what you think about it! Should I do the trial. You American users that use these offer sites a lot, how do you go about credit card detail offers? Do you do them? Please let me know all about your experiences with these type of offers! Thank you for your help!