Basement badge.

how to get:
first. you need to go to the back of the cafe. you need to break the window of a room with a bunch of boxes inside. once you did that. the key is behind the boxes. throw away the boxes and grab the key. once you get the key. you need to go to the staircase and put the key near the unmatched wall. (note: the wall can be easily noticed due to having an unmatched matarial texture. you will easily find it.) once you did that. go to the bent vent and click the red thing. an open space will appear on the unmatched wall. quickly run to it and put the key to the open space. and you're done.

if the badge is not scripted like this. youtube will help.

beware of the evil forces of misha_safe. lock him up inside the basement once he enters it.