The German language is available on the Xiaomi Mix Flip and can be activated during the setup process. Here are some details about the functions:

- German language: yes, the German language can be enabled during the setup of the smartphone and all apps should then be available in German.
- Google Pay: Yes, Google Pay should work, as the smartphone did not pass the SafetyNet test, but Google Pay can still be used.
- Google Fit: There is no specific information that Google Fit would not work. Since the Google Play Store is officially certified, all Google services, including Google Fit, should be available in principle.
- Android Auto: No, unfortunately Android Auto does not work with the Xiaomi Mix Flip.

Overall, most Google services and functions are available, but there are some limitations, especially with Android Auto.