The Native external references feature is now supported in the Content Delivery (CDA) and Content Preview API (CPA). To enable the feature, simply include the externalReferences=* query parameter in your requests.

With Native external references you can integrate content from external sources using the Contentful App Framework. This feature removes the need to make two separate requests (to Contentful and the third-party service), and it handles synchronous delivery.

For more information about the feature, see Native external references and the developer documentation.