All users can locate their API key at the bottom of the Profile page.
API tokens can be used to set up custom integrations. Should you need to revoke this access to your Toggl Track account, you can also reset the API token on this page.
More information on the Toggl Track API can be found here.
Do you need further help with anything? Feel free to contact our support team via the chat button in the bottom-right corner, or email.