In finance and in the banking community, this lag time in posting the actual returned refund is often referred to as "The Five Day Float..." It's an interest skimming technique once employed by Goldman Sachs in the 70's, but made popular by the gaming industry in New Jersey and Las Vegas in latter years. It has reared its ugly head in online banking more recently, and if you believe this practice isn't being utilized on Paypal you are absolutely wrong....
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