Open the Samsung Wallet app, then click on MENU at the bottom of the screen. From there, click on PRIVATE INFO in the SAMSUNG PASS section of your screen. Select the card that you have the dispute with, then click EDIT. This should now display your 16-digit card number. The vendor that you are in dispute will have the last 4 digits of your digital card number (not the physical card number). You should now have the proof you require.