
Example XML for item level updates:
Returns (returns/example.xml)
<r:returned>
<r:reference>ABC</r:reference>
<r:items>
<ri:item>
<ri:order_item_id>100</ri:order_item_id>
</ri:item>
</r:items>
</r:returned>
</returns>
Cancellations (cancellations/example.xml)
<c:cancellation>
<c:items>
<ci:item>
<ci:order_item_id>100</ci:order_item_id>
</ci:item>
</c:items>
</c:cancellation>
</cancellations>
Shipments (shipments/example.xml)
<s:shipment>
<s:tracking>357256761</s:tracking>
<s:items>
<si:item>
<si:order_item_id>15241567972973</si:order_item_id>
<si:quantity>2</si:quantity>
</si:item>
</s:items>
</s:shipment>
</shipments>