Having been attempting to get Curve Pay to work it looks like it would require HMS Core (Huawei Mobile Services) and for Curve to be downloaded from the Huawei App Gallery (so needing that too).
I will continue to investigate this on my non production/daily driver Pixel 3 when I have the time.
Stocard looks like the most promising straight forward solution for now dependent on region.
Some banks and their apps also work in this regard but if you are a customer of one I imagine you'd know about it.