To unlock the "Impor Token" trophy in Papers, Please, the player must allow an Imporian woman through to see her son.
The event occurs on Day 4, November 26th. The fifth entrant to the booth will be an Imporian woman. Her entry permit is always expired. You must discover the discrepancy and interrogate the entrant. You can't simply allow her in without questioning the problem, as she won't give you the token. Once she explains her situation, you must then allow her entry. You'll get a citation, but you'll also get the token -- and the trophy will unlock.