There's not only the information that has to fit. Seems like each card number has some sort of hidden "risk" or whatever rating which seems to be shared globally. That value seems to varies depending on where the card was issued and by which financial firm or bank. For example, digital-only (cyber) bank have super low rating right from the start while international banks with high standing in the financial world has high rating. It seems that Paypal card registering system consider that number and, if the rating is too low, blacklist certain cards. In my case, I have this problem with a Mastercard card and that's because of Paypal's system being US-based on the date and warning system. To put thing in a simple perspective, in Canada, the expiration date on a card is on the 1st of the month while in the US it's on the last of the month. This made Paypal start giving me warning of the expiration of my card 2 weeks AFTER it expired. (On top of that, my new card was issued at my previous address, which luckily at least, was my parents' where I lived while I was studying.) During those 2 weeks, the number of failed purchase attempts on my credit card was insane and Paypal was automatically taking it from my bank account instead as the 2nd payment method. When I tried to update the card as I received the new one my parent mailed to me, it wasn't able to do it. I decided to remove the card and add it back in and, at that point, the card number is "invalid" in Paypal's system. When I contacted the support, I was told that too many failed attempts was done on the card and it's blacklisted. Only solution is to get a new card with a new number from the financial institution who issued the card to me.
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