Since you need it just for you. You don’t need to put it on a “web accessable server”
You just need a bit of code to raise on say port 8000 some thing that can accespt a code from http query get
Exchange that code for the tokens payload.
Then turn the server off.
You can then give the token payload to your sub collector, and the sub collector can renew the token when it needs/wants to since it has all the information it needs.