I get the same issue An error has occurred while processing your payment, please try again. Or contact us for assistance. I've also noticed this issue occurs when trying to make a payment through paypal, after checkout it goes to the paypal payment summary page and login, when user logs in, the page shows as blank, then locks out the product until I clear my store cache, however all paypal payment are down at the moment. I've raised a case 24 hours ago and had no response!
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