I had the same issue with two different card (Mastercard and Visa debit card) and I was frustrated by the error message ("An Issue Occurred"). But the message was more implicit in the response from the API call in the Chrome DevTools Network Activity inspector. The error was saying that I need to wait 24 hours before trying again after three failed attempts. I guess that the Mastercard failed for some reason and I clicked "try again" three times before trying the visa card. That's why I received the same error for the visa card. Then I tried again the visa card a day later and it worked.
So if you're having the same issue, I would suggest to look in the response from the API to see if there is more details about why it's failing.
Amanukyan
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