Possible values for permission.

UNSPECIFIED_PERMISSION Unspecified permission.
NAME Ask for user's first and last name.
DEVICE_PRECISE_LOCATION Ask for user's precise location, lat/lng and formatted address. Returns only lat/lng on phones.
DEVICE_COARSE_LOCATION Ask for user's coarse location, zip code, city and country code. Works only from Google Home devices.
UPDATE Ask for permissions to send updates.