/// <summary>
/// Schedule Campaign Blast time
/// <param name="campaignId">Unique id for the campaign</param>
/// <param name="dateTime">Schedule time in UTC format</param>
/// </summary>
internal async Task <dynamic> ScheduleCampaignAsync(string campaignId, DateTime dateTime)
{
string endpoint = Authenticate.LegacyEndPoint(TargetTypes.campaigns, SubTargetType.schedule);
Schedule content = new Schedule()
{
apikey = Authenticate.FetchApiKey(),
cid = campaignId,
schedule_time = dateTime
};
return(await BaseOperation.PostAsync <Schedule>(endpoint, content));
}