1. Print the cards
  2. Top up every card
  3. Give away the card to a friend
  4. The friend can redeem the sats
Right, thanks.
In case someone else is wondering like me: the first time you read the card, you need to do so with a normal QR scanner, not with your wallet's (or at least, my bluewallet wouldn't work). That's what I missed. Then, you will be redirect to a page where you have the actual QR code that you can use to fund the tip card.
Once the tip card is funded, you can read it with a wallet and it will recognize it as a valid LNURL withdraw.
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How to top up card?
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