I guess you may need to use some google pay alternative? If yes, afaik there is no foss option. For contactless payment with my phone I use curve, it does not require google play services, so while it's closed source, it should work on a completely degoogled phone. If you can't find a foss solution, I recommend this: https://play.google.com/store/apps/details?id=com.imaginecurve.curve.prd
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I've been happy with Catima.
I have no experience but FossWallet looks interesting.
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