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I think it is the safest way I know so far.
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I think it is the best, Not like the CC gateways you are not exposing your CC to external world.
I assume it is safe because their liability would be huge if they do not take the right precautions. I also keep a close eye on my credit cards to be sure nothing is there that does not belong.
it is fairly safe, they take a lot of precautions :-)
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