FieldDefinitions collection
This API applies to InvoiceDefinition object.
The properties of FieldDefinitions collection API are:
A FieldDefinitions collection contains 0, 1 or more FieldDefinition objects.
It represents the collection of field definitions which contain information about where a field is located on a unique invoice, what type of data it is expected to contain, how it should be validated, etc.
The FieldDefinitions property returns the collection of field definitions on an invoice definition.