I have both, from Revolut, a MasterCard and a Visa, none of them have PREPAID printed on it. Not on the front and not on the back.
But i understand that they are prepaid cards.
Ohh for f*** sake 
I checked the card three times earlier today and could not find any print. Now, after you pointed it out, I checked that very location specifically and actually did find it. Either you have one of the most sensitive cameras in the world 
or the print is even lighter and tinier in my case 
Anyway, thanks @Platin, should I ever need to prove to someone what kind of card it is I now know where to point to … (wouldhaveneverfoundthat 
)
LMAO 
welcome to the club
Mines have both on back left up corner of the signature box. But the blue/ standard card is less visible.
On the black one they used white 
so I had to use a black marker 
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I had to take a magnifying glass to make that out! 
BTW at
https://www.revolut.com/dk/cardholder-terms
It clearly states what kind of card revolut issues and that they are not connected to a bank account 
Jolly good, thats the legal speak. Does not change the fact that it is bound to your currency pools/accounts/whatever you want to call them.
We have already established that the merchant declined the card because it is listed as prepaid card.