CARTO Maps API v3 allows you to create map layers using data from different data warehouses. It uses an existing connection in your CARTO 3 account to access the data securely and is able to return layers in a multitude of formats. Learn more about connections here.
CARTO Maps API v3 uses an access token as the authorization method. Learn more about obtaining and using access tokens in the general Authorization section.
Find the complete API reference and a Postman collection at api-docs.carto.com.