public JsonResult GetCustomers(int jtStartIndex = 0, int jtPageSize = 0, string jtSorting = null)
{
if (graphService.app_id != resellerService.graph_app_id || !graphService.initialized)
graphService.Initialize(resellerService.tenant_name, resellerService.graph_app_id, resellerService.graph_app_key);
List<Contract> contracts = graphService.GetContracts().OrderBy(x => x.displayName).ToList();
return Json(new { Result = "OK", Records = contracts, TotalRecordCount = contracts.Count });
}