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To add some validity to
Also Spar uses a franchise model for its store distribution, which makes it possible to one store accept whichever way they choose to.
I've also found an article from 2018 about the same that states.
Spar is the first known shop of a large chain in the Netherlands that accepts Bitcoins. Bitcoiners can load the payment on their mobile phone or tablet. The supermarket has a tablet on which the amount is struck. The buyer takes out his phone and uses the code to make the payment.
Gelder revealed that the store will be processing the payments via a point-of-sale system provided by Dutch firm BitKassa. Also, the supermarket has decided to convert the cryptocurrency into Euros, which are later deposited into their bank account.