Type defining the AddItemRequestContainer containers that are used in an AddItems call. An AddItemRequestContainer container is required for each item being created through an AddItems call. Each item being created through an AddItems call is identified through a unique AddItemRequestContainer.MessageID value that is defined by the seller.
Most Trading API calls support a MessageID element in the request and a CorrelationID element in the response. With AddItems, a unique MessageID value is required for each AddItemRequestContainer container that is used in the request. The CorrelationID value returned under each AddItemResponseContainer container is used to correlate each item request container with its corresponding response container. The same MessageID value that you pass into a request will be returned in the CorrelationID field in the response.
See the Field Index to learn which calls use MessageID.