Listen API uses API Key tokens for authentication.
You can generate API Key in API module located under Profile settings

Request authentication
Once you have your API Key you should include it in every request via X-API-KEY
header as in the example below
curl -H 'X-API-KEY: your_secret_key_here' \
https://sentione.com/api/public/v2/projects
Legacy API Compatibility
Listen API Keys work with V2 onlyAPI Keys generated directly inside Listen work only with V2 API.
They can not be used to access Legacy API (https://sentione.com/api)