Each API request will have to contain request headers that include your access token to authenticate the request. Don't have an access token? You will find your access token in the API settings page of your Exotel Dashboard.
HTTP requests to the REST API are protected with HTTP Basic authentication. You will use your Exotel API key as the username and your API token as the password for HTTP Basic authentication. You can find your API key and API token on your Exotel Dashboard.