To set user flags (additional properties), use the command user/update_user_flags:

svc=user/update_user_flags&params={"userId":<long>,
				   "flags":<uint>,
				   "flagsMask":<uint>}

User settings flags:

The example of using mask and user settings flags:

We need to allow user changing password (0x02), to forbid changing settings(0x10), and to leave all the other flags without changes. In such case mask will be 0x2 + 0x10 = 0x12. Flag 0x02 must be removed, and flag 0x10 must be set, therefore parameter flag will be 0x10.

{
	"fl":<uint>	/* flags */
}