/// <summary>
/// Users / List Items / Add items to custom list
/// http://docs.trakt.apiary.io/#reference/users/list-items/add-items-to-custom-list
/// Add one or more items to a custom list
/// </summary>
/// <param name="userName">The name of the user</param>
/// <param name="traktId">Trakt ID of the list</param>
/// <param name="customListItemIds">The ids of the items to add to the list</param>
/// <returns>Number of items added</returns>
public Task <AddItemsToCustomListResult> AddItemsToCustomListAsync(string userName, int traktId, CustomListItemIds customListItemIds)
=> ExecutePostRequestAsync <AddItemsToCustomListResult>($"users/{userName}/lists/{traktId}/items", customListItemIds);
/// <summary>
/// Users / Remove List Items / Remove items from custom list
/// http://docs.trakt.apiary.io/#reference/users/remove-list-items/remove-items-from-custom-list
/// Remove one or more items from a custom list
/// </summary>
/// <param name="userName">The name of the user</param>
/// <param name="traktId">Trakt ID of the list</param>
/// <param name="customListItemIds">The ids of the items to remove from the list</param>
/// <returns>Number of items removed</returns>
public Task <RemoveItemsFromCustomListResult> RemoveItemsFromCustomListAsync(string userName, int traktId, CustomListItemIds customListItemIds)
=> ExecutePostRequestAsync <RemoveItemsFromCustomListResult>($"users/{userName}/lists/{traktId}/items/remove", customListItemIds);
