So with my co-worker who was responsible for the FE part ( i was doing BE part ), we encountered the same issue. We struggled a little bit with account configuration but in the end, my friend identified that problem was on the FE part, particularly in requestPaymentMethod. His explanation:
requestPaymentMethod should be called after the user has selected a payment option, or when he filled in correct credit card details if it’s the only payment option.
From what I see in your post I see that maybe it is the same mistake.
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