You can soon do UPI even if you don't have Indian bank account, you can just download an app and connect any payment source to your UPI ID.
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If you have guidance on how to setup Google Pay/other with UPI it would be appreciated. I even tried updating my Google Pay software to get the Indian version in the hope it would work.
UPI is great and I hope it becomes worldwide. I think they started in France recently. If you are an Indian citizen/OCI holder encourage your foreign banks to get involved. I do not have much hope for Canadian oligopoly banks but if a bank in the US got it I would move some of my money there.