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I understand that Coinbase is working on a problem with credit card authorization. It seems like many are getting CVN errors while attempting to add a card type payment method. I sounds like they will have it resolved soon. Is that the problem you are writing about?

Hello,
I have been attempting to purchase cryptocurrancy from both Coinbase and Gemini over the last two weeks too, and cannot do so. I have used both credit cards and bank wires, with no luck. It is indeed very frustrating.