EntityBase

Name	Type	Description
BrickId	Guid	BrickId is the internal id of objects in BFS
RequestReference	string	A reference that can be used to keep track of a specific object
Errors	string[]	An array of the different errors in the request
CreatedDate	DateTime	The date on which the entity was created
CustomFields	CustomField[]	Array of CustomFields[]

Most of the objects in the API methods inherits from EntityBase.

BFS API