Error 400, where to get a redirect URL?

[db12515]

Hello, I am just trying to make a python script that downloads my personal emails with gmail API. I keep getting an error 400 and I have no idea where I get a redirect uri. One stack overflow said to use "http://localhost/Callback" but that did not work. I don't have a website or server and no one else will be using this program.

Does anyone know what I can put in for a redirect uri or another way to fix this issue?

My knowledge of programming is incredibly basic. Thank you for your time!