In the root of the project, copy and past the ".env.example" file and rename it to ".env".
Now let's get the Figma Token, go to this link: https://www.figma.com/settings, and follow the instructions as the gif below.
Once you got that, paste in the .env file on "FIGMA_TOKEN" parameter.
Now let's get the file you are using, once you open the figma file, you can get that on the URL:
Go back to your ".env" file and paste it on "FILE_ID" parameter.
Your file should be like that:
All right, now we just need to run the script to get the icons.