EDIT: I forgot it's also Guarda.
I was trying to buy this big dip and even try the 0-fee Euro purchase out of curiosity but it kept failing.
Called my bank's card services today and they said purchases to the company shown in the transaction history has been blocked due to customer complaints to their fraud and phishing department. Not sure if it's just a quick move to be safe or if they've done some investigating to consider it confirmed. It sounded more like the former, but the person couldn't tell me for sure since these are different departments.
This is more of an FYI in case anyone in Korea has problems. It could be a point of discussion too.
Why could this be happening? Uphold also failed for me though I didn't confirm it was the same problem.