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How do I “verify payment information”?

Alright so, i just registered a new credit card and put in all of the information correctly. But for some reason, it said that it failed and that I need to “verify” the card. But they didn’t even say how to, and that’s why I’m frustrated. These support forums aren’t even helping, sadly. If someone could tell me what was going on and how I could “verify payment information”, then I would be very thankful. Thank you :)