Hi in magento2 default API order item interface i need to add custom fields those are not attributes just i need to add custom flags in soap API based on order id flags will come how to add that it is soap API in Magento 1 we can override API file and we can add in item for-each loop but magento 2 i tried Item file but i did not find item loop and where they are preparing
I have tried with extension
<extension_attributes for="Magento\Sales\Api\Data\OrderInterface"> <attribute code="fee" type="integer"/> </extension_attributes> <extension_attributes for="Magento\Sales\Api\Data\OrderItemInterface"> <attribute code="handling_charges" type="integer"/> </extension_attributes>
and added function in order interface file but no luck
Message: Class "this" does not exist. Please note that namespace must be specified.