I think Kiva.org uses PayPal as a processing method. 

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PayPal Says Merchant Rules Level Playing Field In Exit Bid

By Henrik Nilsson

PayPal urged a California federal judge on Friday to toss a proposed class action alleging the financial tech giant illegally boosts online retail prices by enforcing restrictive merchant agreements, saying PayPal's practices enable it to compete on an equal footing with other payment options.

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