Winter '27 (API version 68.0)
1{ 2 "manageLinksRequest": [ 3 { 4 "sourceLineItemId": "801xx0000012AbcAAE", 5 "relatedItemIdsToLink": ["801xx0000012DefAAE"], 6 "relatedItemIdsToUnlink": ["801xx0000012GhiAAE"] 7 } 8 ] 9}