Monero.
Otherwise I don't know if you'll find an open source alternative to Google wallet, since the banking system overall is very much the opposite of open source
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Monero.
Otherwise I don't know if you'll find an open source alternative to Google wallet, since the banking system overall is very much the opposite of open source
They have to be certified by Mastercard/Visa, so no chance for open source. A few banks have their own implementation. Apart from mentioned samsung has its own version.
Do not know of any open source alternatives and it is surprising to me there are none. To my understanding, all that is needed as a mobile app that one can store their credit card on (number, expiry, cvc) and have NFC for permission for tap payments. The app should be able to function offline since the payment is done though the NFC, not your phone's internet connection.
Garmin Pay
Requires a Garmin watch instead of a phone. Not open source.
Garmin watch
I can use alipay too with my xiaomi band, but its the same, so i prefer google pay haha