This tag is used with questions related to payment cards. If your question is regarding security of payment card data, then you may want to consider using the pci-dss tag. Note that much of the advice surrounding this topic is region dependent, so it will help if you mention where in the ...

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How to report attempted credit card fraud?

I run a website which accepts credit card payments. I recently noticed that one user who used many different names and/or email addresses attempted to make almost a hundred credit card transactions ...