If you want to enable Android Pay while using a rooted Android device, Magisk APK should be able to help you do that. This is a universal systemless root interface that will allow you to enjoy both root and apps that don’t run with root.
Now, installation will require you to wipe all of your data and flash the Magisk ZIP file using TWRP or CWM recovery. After that, you will also have to install Magisk-compatible SuperSU and Xposed (if you want Xposed).
We should have full step-by-step tutorial soon but Magisk should allow you to enable Android Pay and also play Pokemon Go for rooted Android devices.
For installation, reboot into TWRP, do a factory reset, install Magisk ZIP FIRST then Magisk SuperSU ZIP file then reboot. Once rebooted, sign in then install Magisk Manager APK. Open Magisk Manager app then disable root to play Pokemon Go or use Android Pay. When you need root, simply enable root in Magisk Manager, that’s it!
Credits – XDA
To use Xposed with Magisk, you will need to grab the Magisk-compatible Xposed Installer APK instead of regular Xposed Installer.
What is an APK File?
APK File is a file/app that can be installed on any Android smartphone or tablet. Using an APK file, you can install Android apps manually on your Android device.
You do not need a rooted Android device to install APK files. For installation instructions, please see below.
How to Install APK Files
You will need to make sure Unknown Sources is checked ON in Settings to install APK files. We do recommend you to use a file explorer app such as ES File Explorer, available on the Play Store for free, to install these apps.