As a user with a lot of credit cards loaded into Samsung Pay, I would find it extremely useful to be able to add notes for the card that would show before you authenticate the card for payment. I personally would use this to display what the card's rewards are so I ensure I get the best rewards every time. For example, I would add a note to my DoubleCash Card for "2% on everything" or on my Costco Visa I would add "4% Gas, 3% Restaurants, etc". I have attached a very rough example.
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