Advice on stopping donation fraud

I work for a non-profit organisation and have created and online donations page. Recently this donations page has been used to validate stolen credit card details via the process known as Carding.

The way it works is that a开发者_如何学Python slacker get hold of a whole bunch of credit details but doesn't know which numbers are good or not. So they go to a donations page and attempt a small donation ($5 or less) with the stolen card number. If the donations goes through then they can use the number for bigger purchases.

Carding can cost a non-profit a lot of money as most these "donations" will end being reversed and in some cases a charge back fee will be charged by the bank.

Has anyone else had experience with this? Also, what are some ways that I could stop it?

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Off-topic, but I'll bite:

• Don't accept "small" donations.
• Don't accept "many" donations from the same IP address in a "short" time span.
• Consider buying credit card fraud insurance.

What "small," "many," and "short" means is up to you.

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Source

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Full disclaimer: I have no affiliation with PayPal or any credit card company. I do not run, or have any first-hand experience with, an e-commerce site, nonprofit site, or any other web site which accepts electronic payments. I am not a lawyer. I'm just a programmer.