Guys,
today after flashing TWRP .37 I got to format my DATA (sigh), so I ended up losing all (of course, not all, because .37 TWRP supports encryption for Q, so I downloaded my pix and etc).
BUT!
What I did? I wanted to have a clean install so I downloaded and installed via FASTBOOT the latest China Dev Rom (MIUI CN). Of course it was Pie based. So I flashed TWRP and installed the closed beta MIUI 10 China ROM.
After that I flashed 9.8.15 Xiaomi.eu only to realize that if you DONT fix Google Pay under Pie, you have no chances (as of today) to fix GPay under Q...
So what I did:
1. Installed latest China Dev MIUI fastboot with Mi Flash
2. Install custom TWRP .37 (Q +P) recovery
3. Install
xiaomi.eu (P based) - version 9.8.1 last PIE xiaomi.eu for Mi9
4. Installed - Magisk 19.3
5. Installed - Installed ->
https://github.com/davidramiro/gpay-gms-patch/blob/master/README.md
6. Applied gms patch (via termux/terminal as per the instructions)
7. Setup Google Pay with Revolut - ALL working
8. Via TWRP flashed 9.8.15 (re-upload v2 rom)`
And this is how I got 9.8.15 Q + Magisk + Gpay