~ snip ~
I figure Burger King themselves will choose receive their payment settlements in fiat, and not in crypto.
Right, so this is not P2P as everyone as expected, a middleman is still needed in this case, Bitpay - the largest bitcoin payment processor. But we have to understand that this is Germany wherein Bitcoin adopted is really huge so no surprise here. But regarding mass adoption? We still have a long way to go, perhaps LN could help us achieved that so we will have to wait a big and see how it goes.
At first read up i though Burger King in Germany accepts p2p but as stated they do make use of Bitpay which im aint surprised since they do try to make themselves safe from volatility but at least we do able to see that theres already a recognition.