For contactless payments to work properly on Huawei phones, follow these steps:
Set up NFC and default payment service
Open the Settings app
Tap More connections (or Device connectivity)
Tap NFC and turn NFC On
Tap Default payment app / Contactless payments and select Swoo Pay as the default payment app
Set up permissions for Swoo
Return to the main menu of the Settings app
Go to Apps → Apps → Swoo
Tap Battery usage and choose Allow background activity (prevents EMUI from putting the app to sleep)
Tap Mobile data and make sure Allow background data usage stays On
Tap Display over other apps and allow the permission
(If shown) go back, tap Modify system settings, and allow
Menu item names and their order may be different on your phone. If you can’t find the right settings, visit the Huawei support site for help or reach our support team any way you like
in-app chat (the "Chat" tab in the bottom navigation bar)
in-app contact form ("Menu" → "Contact us by email")