Which API attribute is used to retrieve linked objects in a single call?

The retrieval of linked objects in a single API call is efficiently handled using the Expand Fields attribute. This functionality allows users to request additional related objects within the same API query, thereby reducing the need for multiple calls to gather all necessary data.

For example, when retrieving a charge, you might want details about the associated customer or the payment method used. By specifying the related objects to be expanded through the Expand Fields attribute, you ensure complete information is included in one response. This not only optimizes performance by minimizing round-trip calls to the server but also simplifies data handling on the client side.

The other options, while they may sound relevant, do not directly pertain to the operation of retrieving linked objects within a single API call in the manner that Expand Fields does. Nested Objects, for instance, refers more to data structure than to the retrieval method, and terms like Linked Resources and Related Data do not correspond to specific API functionality designed for this purpose. Expand Fields is the defined attribute that enables this seamless retrieval.