Where is my Developer/Bearer/ Personal access token?
How long is my Bearer token valid?
How to obtain a longer lifetime access token with OAuth authorization grant flow
Answer
Kindly visit https://developer.webex.com/docs/getting-started, once logged in, you will find your "Personal Access Token or the Bearer token" which can be used to interact with the Webex API as yourself.
This token has a short lifetime - only 12 hours after logging into this site-so it shouldn't be used outside of app development. When using this token, any actions taken through the API will be done as you.