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The thing is, anything involving credit-card transactions needs to have very tight security, which you probably wouldn't get out of any free products.
Also, you'd probably want SSL and whatnot.
So my answer is... I wouldn't really have a clue.... but keep these points in mind.
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flux (n.)
Medicine. The discharge of large quantities of fluid material from the body, especially the discharge of watery feces from the intestines.
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