Getting your API token
log in to PythonAnywhere, and go to the "Account" page using the link at the top right. Click on the "API token" tab; if you don't already have a token, it will look like this:
Click the "Create a new API token" button to get your token, and you'll see this:
That string of letters and numbers (masked out in the screenshot) is the API token, and anyone who has it can access your PythonAnywhere account and do stuff -- so keep it secret. If someone does somehow get hold of it, you can revoke it on this page by clicking the red button -- that stops it from working in the future, and creates a new one for you to use.