Plugin for" AddMember" message is not executing when a record is added dynamically to a marketing list.

Hello All,

Plugin is not executing when a record is added to marketing list using a webservice. Below is the code i have used for adding record to marketing list by creating a webservice. But the same plugin is getting executed when a record is added manually to marketing list. How to trigger plugin even when record is added to marketing list using web service.

AddListMembersListRequest req = new AddListMembersListRequest();
                    req.ListId = listid;
                    //add the new list of marketing list memnbers
                    req.MemberIds = new System.Guid[1];
                    req.MemberIds[0] = contactid;

                    AddListMembersListResponse resp = (AddListMembersListResponse)service.Execute(req);

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