In a new tab, go to your Account Settings on Coda:

https://coda.io/account Scroll down to find the API SETTINGS section. Click "Generate API Token", leave all settings as default, and again click "Generate API Token".

Copy your token. Save your token somewhere private, you won't be able to copy it later (but you can always make a new one).

Tip: Use the same token you used for the checkpoint app.