Similar to AddItemRequestType, the AddItemRequestContainerType defines a single item to be listed. The AddItems request will support up to five (5) request containers.
The MessageID element is used to correlate a given AddItemRequestContainer in the request with the corresponding AddItemResponseContainer in the response. When you pass a message ID in a request container, the same value is returned in the CorrelationID field in the matching response container. You can use this for tracking that a response is returned for every request and to match responses to specific requests.
See the Field Index to learn which calls use MessageID.
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