public async Task SendAuditorApprovalEvent(
            [HttpTrigger(AuthorizationLevel.Function, "post", Route = null)]
            HttpRequestMessage req,
            [OrchestrationClient] DurableOrchestrationClient context,
            ILogger log)
        {
            var approvalRequest = JsonConvert.DeserializeObject <SendAuditorApprovalRequest>(await req.Content.ReadAsStringAsync());
            var instanceId      = await _approvalService.GetInstanceId(approvalRequest.WorkflowId);

            await context.RaiseEventAsync(instanceId,
                                          $"E_AuditorApprovalEvent_{approvalRequest.WorkflowId.ToString()}",
                                          approvalRequest.EventData);
        }