Since I will be lending my phone to someone else, I want my phone to ask my Google account password (or alternative authentication) each time an app is installed.
If I go to Google Play -> Three bars menu -> Settings -> Require authentication for purchases, the options are:
The first option seems to be what I am looking for. Nevertheless, I am not asked for any authentication for installing apps.
Can this be done? How?
Using a Samsung Galaxy J7, with Android 6.0.1.