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Do you have any information on why Google would block these CC numbers? I know Google, and many others block VOIP phone numbers for example, to discourage rampant account verification, but I can't think of why they would reject a financial reference number.

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I imagine it's to stop people from connecting stolen cards to the service and then generating a bunch of other card numbers that are essentially all stolen. It could potentially allow them to use the stolen card more before it was detected.

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