Awesome job mate! I was stuck with Pixen2 which is just bugful and they don't support it anymore, so you've just saved me! Thanks for your interest in Oneplus5 and AOSP
Do you still have the Hype app as the default tap & pay app under settings/apps/advanced/default apps/tap & pay?
Yes I do, but I usually open the app manually before the payment as it's faster.
Sent from my OnePlus 5 using XDA Labs...