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You don't need a brazilian tax ID to use PIX, I've used it from MercadoPago from another country and there are a lot of options to use it besides MP.
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There is India's UPI (launched in 2016), Singapore PayNow (Launched 2017) that works in a similar way. And they also work across each platform.. UPI users in India can transfer to Paynow users in Singapore and vice versa.

[1] https://www.dbs.com.sg/personal/deposits/pay-with-ease/payno...

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some UPI users to some Paynow users. (limited to participating institutions only).
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Thailand Promptpay is federated too, as are some Japanese services.
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> but because it can give ideas to other countries doing the same

This is happening right now in Europe. You have systems like Blik, Twint, Swish etc.

I know that at least Blik is working on making it possible for international payments.

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> I know that at least Blik is working on making it possible for international payments

International transfers between MB Way (PT) and Bizum (ES) are working e.g. via phone number. See also https://en.wikipedia.org/wiki/European_Payments_Alliance

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What's needed in Europe is federation of the existing systems, not one winner taking it all.
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That's exactly what's happening, see the EU digital euro scheme. It's planned to be free of fees too, modeled around how SEPA was done for wires.

There has been massive resistance by the incumbents of course, including banks (since they too charge a fee on top of visa).

It's been in the backlog for years but the US sanction against ICC judges leading to them being cut off from most things including payment triggered a renewal of it.

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> To be able to pay with Pix, one needs to get a CPF (Brazilian Tax ID).

There are third party apps you can use to pay with pix using a credit card, can't recall that name, but read about it here a few months back, on another pix-thread.

> CPF (Brazilian Tax ID). Then to open a bank account

Getting a CPF is absolutely trivial, but I'm not sure you can open a bank account without RN/RNE, at least not with local banks. Can probably manage with one of the online banks.

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on Europe there is talks about using Spanish's Bizum as the oficial European replacement for Visa/MasterCard
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It's not a replacement until they issue cards that work without a phone.
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"we are going to go back to how people used to travel 50 years ago: with a lot of USD bank notes hidden in your hotel room or elsewhere ..."

Who did that?

Most people except for criminals and refugees used traveller's cheques:

https://en.wikipedia.org/wiki/Traveller%27s_cheque

I think some banks, like AmEx, still issue them.

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