0: https://www.ecb.europa.eu/euro/digital_euro/progress/html/ec...
In practice, people have started to accept it in Portugal, Argentina, Uruguai and some other places where people tend to have accounts both in their countries of residence and Brazil.
Also, Verifone PoS in the US will also accept Pix as well.
What they have there is a Brazilian person receiving payments from another Brazilian person, only through Brazilian accounts, all happening remotely in Brazil(at least for now)
It's the same thing as buying stuff from China with PIX, but the gateway is more hidden from the Portuguese accounts.
Even then, everywhere you go, unless they're really small or old places that still don't accept anything other than cash, you can pay with MBWAY, through a QR code or NFC. All POS terminals support that nowadays. You can even add an email address and VAT number and newer terminals automatically skip printing the customer receipt, send it to your email and give the VAT number to the merchant (not entirely sure how that last one works, but it's there).