I should've been clearer - by Google-approved, I meant that your device has to pass Google's remote attestation scheme. From https://support.wero-wallet.eu/hc/en-us/articles/25599098295...:
> I’m seeing this error message: "Your device does not meet our security requirements".
> /../ If the operating system is an Android variant (also called a 'custom ROM'), such as LineageOS or Pixel Experience, then the wero app can’t be installed for security reasons.