Interactive Door Access passwords

Where are the passwords to Interactive Doors. I found couple on calendars, but I have no clue where the passwords are generally?
Are the passwords are on NPCs you need to subdue to get them?
Are they in dialogues?

They’re either in over-heard dialogue or written down somewhere

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Hitmaps has them documented as such on their site. It’s a work-in-progress, but it’s pretty reliable.