diff --git a/src/dotnet/Common/Interfaces/IDownstreamAPIService.cs b/src/dotnet/Common/Interfaces/IDownstreamAPIService.cs
index e08364ff82..69132b4014 100644
--- a/src/dotnet/Common/Interfaces/IDownstreamAPIService.cs
+++ b/src/dotnet/Common/Interfaces/IDownstreamAPIService.cs
@@ -19,5 +19,29 @@ public interface IDownstreamAPIService
         /// <param name="completionRequest">The completion request containing the user prompt and message history.</param>
         /// <returns>The completion response.</returns>
         Task<CompletionResponse> GetCompletion(string instanceId, CompletionRequest completionRequest);
+
+        /// <summary>
+        /// Begins a completion operation.
+        /// </summary>
+        /// <param name="instanceId">The FoundationaLLM instance id.</param>
+        /// <param name="completionRequest">The completion request containing the user prompt and message history.</param>
+        /// <returns>Returns an <see cref="LongRunningOperation"/> object containing the OperationId and Status.</returns>
+        Task<LongRunningOperation> StartCompletionOperation(string instanceId, CompletionRequest completionRequest);
+
+        /// <summary>
+        /// Gets the status of a completion operation.
+        /// </summary>
+        /// <param name="instanceId">The FoundationaLLM instance id.</param>
+        /// <param name="operationId">The OperationId for which to retrieve the status.</param>
+        /// <returns>Returns an <see cref="LongRunningOperation"/> object containing the OperationId and Status.</returns>
+        Task<LongRunningOperation> GetCompletionOperationStatus(string instanceId, string operationId);
+
+        /// <summary>
+        /// Gets a completion operation from the Orchestration service.
+        /// </summary>
+        /// <param name="instanceId">The FoundationaLLM instance id.</param>
+        /// <param name="operationId">The ID of the operation to retrieve.</param>
+        /// <returns>Returns a completion response</returns>
+        Task<CompletionResponse> GetCompletionOperationResult(string instanceId, string operationId);
     }
 }
diff --git a/src/dotnet/Common/Services/API/DownstreamAPIService.cs b/src/dotnet/Common/Services/API/DownstreamAPIService.cs
index f7c255f76a..4148a41d02 100644
--- a/src/dotnet/Common/Services/API/DownstreamAPIService.cs
+++ b/src/dotnet/Common/Services/API/DownstreamAPIService.cs
@@ -74,5 +74,115 @@ public async Task<CompletionResponse> GetCompletion(string instanceId, Completio
             return fallback;
         }
 
+        /// <inheritdoc/>
+        public async Task<LongRunningOperation> StartCompletionOperation(string instanceId, CompletionRequest completionRequest)
+        {
+            var fallback = new LongRunningOperation
+            {
+                OperationId = completionRequest.OperationId,
+                Status = OperationStatus.Failed
+            };
+
+            var client = await _httpClientFactoryService.CreateClient(_downstreamHttpClientName, _callContext.CurrentUserIdentity);
+
+            _logger.LogInformation(
+                "Created Http client {ClientName} with timeout {Timeout} seconds.",
+                _downstreamHttpClientName,
+                (int)client.Timeout.TotalSeconds);
+
+            var serializedRequest = JsonSerializer.Serialize(completionRequest, _jsonSerializerOptions);
+            var responseMessage = await client.PostAsync($"instances/{instanceId}/async-completions",
+                new StringContent(
+                    serializedRequest,
+                        Encoding.UTF8, "application/json"));
+
+            _logger.LogInformation(
+                "Http client {ClientName} returned a response with status code {HttpStatusCode}.",
+                _downstreamHttpClientName,
+                responseMessage.StatusCode);
+
+            if (responseMessage.IsSuccessStatusCode)
+            {
+                var responseContent = await responseMessage.Content.ReadAsStringAsync();
+                var longRunningOperationResponse = JsonSerializer.Deserialize<LongRunningOperation>(responseContent);
+
+                return longRunningOperationResponse ?? fallback;
+            }
+
+            return fallback;
+        }
+
+        /// <inheritdoc/>
+        public async Task<LongRunningOperation> GetCompletionOperationStatus(string instanceId, string operationId)
+        {
+            var fallback = new LongRunningOperation
+            {
+                OperationId = operationId,
+                Status = OperationStatus.Failed
+            };
+
+            var client = await _httpClientFactoryService.CreateClient(_downstreamHttpClientName, _callContext.CurrentUserIdentity);
+
+            _logger.LogInformation(
+                "Created Http client {ClientName} with timeout {Timeout} seconds.",
+                _downstreamHttpClientName,
+                (int)client.Timeout.TotalSeconds);
+
+            var responseMessage = await client.GetAsync($"instances/{instanceId}/async-completions/{operationId}/status");
+
+            _logger.LogInformation(
+                "Http client {ClientName} returned a response with status code {HttpStatusCode}.",
+                _downstreamHttpClientName,
+                responseMessage.StatusCode);
+
+            if (responseMessage.IsSuccessStatusCode)
+            {
+                var responseContent = await responseMessage.Content.ReadAsStringAsync();
+                var longRunningOperationResponse = JsonSerializer.Deserialize<LongRunningOperation>(responseContent);
+
+                return longRunningOperationResponse ?? fallback;
+            }
+
+            return fallback;
+        }
+
+        /// <inheritdoc/>
+        public async Task<CompletionResponse> GetCompletionOperationResult(string instanceId, string operationId)
+        {
+            var fallback = new CompletionResponse
+            {
+                OperationId = operationId,
+                Completion = "A problem on my side prevented me from responding.",
+                UserPrompt = string.Empty,
+                PromptTokens = 0,
+                CompletionTokens = 0,
+                UserPromptEmbedding = [0f]
+            };
+
+            var client = await _httpClientFactoryService.CreateClient(_downstreamHttpClientName, _callContext.CurrentUserIdentity);
+
+            _logger.LogInformation(
+                "Created Http client {ClientName} with timeout {Timeout} seconds.",
+                _downstreamHttpClientName,
+                (int)client.Timeout.TotalSeconds);
+
+            var responseMessage = await client.GetAsync($"instances/{instanceId}/async-completions/{operationId}/result");
+
+            _logger.LogInformation(
+                "Http client {ClientName} returned a response with status code {HttpStatusCode}.",
+                _downstreamHttpClientName,
+                responseMessage.StatusCode);
+
+            if (responseMessage.IsSuccessStatusCode)
+            {
+                var responseContent = await responseMessage.Content.ReadAsStringAsync();
+                var completionResponse = JsonSerializer.Deserialize<CompletionResponse>(responseContent);
+
+                return completionResponse ?? fallback;
+            }
+
+            return fallback;
+        }
+
     }
 }
diff --git a/src/dotnet/Gatekeeper/Services/GatekeeperService.cs b/src/dotnet/Gatekeeper/Services/GatekeeperService.cs
index 77f7e726bf..fab476cd80 100644
--- a/src/dotnet/Gatekeeper/Services/GatekeeperService.cs
+++ b/src/dotnet/Gatekeeper/Services/GatekeeperService.cs
@@ -92,17 +92,67 @@ public async Task<CompletionResponse> GetCompletion(string instanceId, Completio
         }
 
         /// <inheritdoc/>
-        public async Task<LongRunningOperation> StartCompletionOperation(string instanceId, CompletionRequest completionRequest) =>
-            // TODO: Need to call State API to start the operation.
-            throw new NotImplementedException();
+        public async Task<LongRunningOperation> StartCompletionOperation(string instanceId, CompletionRequest completionRequest)
+        {
+            if (completionRequest.GatekeeperOptions != null && completionRequest.GatekeeperOptions.Length > 0)
+            {
+                _gatekeeperServiceSettings.EnableAzureContentSafety = completionRequest.GatekeeperOptions.Any(x => x == GatekeeperOptionNames.AzureContentSafety);
+                _gatekeeperServiceSettings.EnableMicrosoftPresidio = completionRequest.GatekeeperOptions.Any(x => x == GatekeeperOptionNames.MicrosoftPresidio);
+                _gatekeeperServiceSettings.EnableLakeraGuard = completionRequest.GatekeeperOptions.Any(x => x == GatekeeperOptionNames.LakeraGuard);
+                _gatekeeperServiceSettings.EnableEnkryptGuardrails = completionRequest.GatekeeperOptions.Any(x => x == GatekeeperOptionNames.EnkryptGuardrails);
+                _gatekeeperServiceSettings.EnableAzureContentSafetyPromptShield = completionRequest.GatekeeperOptions.Any(x => x == GatekeeperOptionNames.AzureContentSafetyPromptShield);
+            }
+
+            if (_gatekeeperServiceSettings.EnableLakeraGuard)
+            {
+                var promptInjectionResult = await _lakeraGuardService.DetectPromptInjection(completionRequest.UserPrompt!);
+
+                if (!string.IsNullOrWhiteSpace(promptInjectionResult))
+                    return new LongRunningOperation() { OperationId = completionRequest.OperationId, StatusMessage = promptInjectionResult, Status = OperationStatus.Failed };
+            }
+
+            if (_gatekeeperServiceSettings.EnableEnkryptGuardrails)
+            {
+                var promptInjectionResult = await _enkryptGuardrailsService.DetectPromptInjection(completionRequest.UserPrompt!);
+
+                if (!string.IsNullOrWhiteSpace(promptInjectionResult))
+                    return new LongRunningOperation() { OperationId = completionRequest.OperationId, StatusMessage = promptInjectionResult, Status = OperationStatus.Failed };
+            }
+
+            if (_gatekeeperServiceSettings.EnableAzureContentSafetyPromptShield)
+            {
+                var promptInjectionResult = await _contentSafetyService.DetectPromptInjection(completionRequest.UserPrompt!);
+
+                if (!string.IsNullOrWhiteSpace(promptInjectionResult))
+                    return new LongRunningOperation() { OperationId = completionRequest.OperationId, StatusMessage = promptInjectionResult, Status = OperationStatus.Failed };
+            }
+
+            if (_gatekeeperServiceSettings.EnableAzureContentSafety)
+            {
+                var contentSafetyResult = await _contentSafetyService.AnalyzeText(completionRequest.UserPrompt!);
+
+                if (!contentSafetyResult.Safe)
+                    return new LongRunningOperation() { OperationId = completionRequest.OperationId, StatusMessage = contentSafetyResult.Reason, Status = OperationStatus.Failed };
+            }
+
+            var response = await _orchestrationAPIService.StartCompletionOperation(instanceId, completionRequest);
+
+            return response;
+        }
 
         /// <inheritdoc/>
-        public Task<LongRunningOperation> GetCompletionOperationStatus(string instanceId, string operationId) => throw new NotImplementedException();
+        public async Task<LongRunningOperation> GetCompletionOperationStatus(string instanceId, string operationId) =>
+            await _orchestrationAPIService.GetCompletionOperationStatus(instanceId, operationId);
 
         /// <inheritdoc/>
-        public async Task<CompletionResponse> GetCompletionOperationResult(string instanceId, string operationId) =>
-            // TODO: Need to call State API to get the operation.
-            throw new NotImplementedException();
+        public async Task<CompletionResponse> GetCompletionOperationResult(string instanceId, string operationId)
+        {
+            var completionResponse = await _orchestrationAPIService.GetCompletionOperationResult(instanceId, operationId);
 
+            if (_gatekeeperServiceSettings.EnableMicrosoftPresidio)
+                completionResponse.Completion = await _gatekeeperIntegrationAPIService.AnonymizeText(completionResponse.Completion);
+
+            return completionResponse;
+        }
     }
 }