Many of the List all operations, for example, GET /sheets, return only an abbreviated object for each object returned. For full details, read a single item, such as GET /sheets/{sheetId}. In many cases, you can refine the exact object properties to be returned by using include and exclude query parameters.
The JSON representation of the objects returned from the List all REST endpoints only include a subset of the resource's properties.
Important: The objects returned from the Java and C# SDKs represent the omitted properties with NULLs.