Huawei Pay is supported in Singapore, just that no local bank supports it. Will need to apply for ICBC UnionPay card.Put inside pocket/bag and go up the bus mrt? Or taking photos? No, just joking no offence.
I suppose you mean using NFC/ bank card. Unfortunately Huawei Pay/wallet not supported in SG. Correct me if I am wrong.
And Huawei has scaled down Huawei Wallet by removing bank card and door access card from Pura 70 series.