/// <summary>
 /// Adds one or more objects to one or more campaigns.
 /// </summary>
 /// <param name="campaignIds">A list of the campaign(s) to which objects should be added.</param>
 /// <param name="searchOptions">The search options.</param>
 public async Task AddToCampaignAsync(IEnumerable <int> campaignIds, ApiSearchOptions searchOptions = null) =>
 await _ontraObjects.AddToCampaignAsync((ApiObjectType)_objectTypeId, campaignIds, searchOptions);
 /// <summary>
 /// Adds an object to a campaign.
 /// </summary>
 /// <param name="id">The id of the object to affect.</param>
 /// <param name="campaignId">The campaign to which the object should be added.</param>
 public async Task AddToCampaignAsync(int id, int campaignId) =>
 await _ontraObjects.AddToCampaignAsync((ApiObjectType)_objectTypeId, new ApiSearchOptions(id), new[] { campaignId }).ConfigureAwait(false);