I don’t see Gold or paid items for sale in Diagon Alley
There are some cases where Gold and paid Items may not appear available for purchase:
Purchase restrictions are enabled: It's possible that you've enabled a setting on your device to prevent someone else (perhaps a child) from making a purchase. Check your Google Play, Galaxy Store or iTunes settings to ensure that you’re able to make purchases from apps.
Data connection issues: Ensure your device is connected to a reliable data connection (Wifi, 3G, or 4G). Try switching internet sources: if you have trouble connecting on Wifi, try to connect using 3G or 4G. If you have trouble connecting on 3G or 4G, try to connect using Wifi.
(Android only) Google Play Services is disabled: Harry Potter: Wizards Unite needs to communicate with Google Play Services in the background to process purchases. Some devices' data saver settings disable Google Play Services ability to access background data. You can try toggling the background data setting: Go to Settings > Data usage > Google Play Services, and enable background data.