If it's a password or secret api key, assume it has been harvested by nasty robots and an evil hacker is planing to use it. Rotate them as soon as you can, aka NOW!
As always, I recommend to read whatever patio11 wrote about it. He had a video course a few years ago. Apparently, it's easier to charge more for video than text. The problem is that I can't find where he said that. Here is a link for his site in case you can find something interesting https://www.kalzumeus.com/greatest-hits/
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