curl --location --request DELETE 'https://prod.your-api-server.com/campaign-item/880e8400-e29b-41d4-a716-446655440003/mos-information' \
--header 'Authorization: <api-key>'{
"_id": "880e8400-e29b-41d4-a716-446655440003",
"clientId": "client123",
"campaignId": "550e8400-e29b-41d4-a716-446655440000",
"itemId": {
"_id": "660e8400-e29b-41d4-a716-446655440001",
"name": "Promotional Flyer",
"posNumber": "FLY001"
},
"status": 102,
"qty": 500,
"mosInformation": {},
"meta": {
"preservedCustomField": "This field remains"
},
"createdAt": "2025-09-09T10:00:00Z",
"updatedAt": "2025-09-09T16:30:00Z"
}