diff --git a/src/ReC.Client/Api/BaseCrudApi.cs b/src/ReC.Client/Api/BaseCrudApi.cs
index a6c4cbe..3728b11 100644
--- a/src/ReC.Client/Api/BaseCrudApi.cs
+++ b/src/ReC.Client/Api/BaseCrudApi.cs
@@ -2,6 +2,7 @@ using System;
 using System.Net.Http;
 using System.Threading;
 using System.Threading.Tasks;
+using Microsoft.Extensions.Logging;
 
 namespace ReC.Client.Api
 {
@@ -20,15 +21,30 @@ namespace ReC.Client.Api
         /// </summary>
         protected readonly string ResourcePath;
 
+        /// <summary>
+        /// An optional logger used to record API call outcomes. May be <see langword="null"/>.
+        /// </summary>
+#if NETFRAMEWORK
+        protected readonly ILogger Logger;
+#else
+        protected readonly ILogger? Logger;
+#endif
+
         /// <summary>
         /// Initializes a new instance of the <see cref="BaseCrudApi"/> class.
         /// </summary>
         /// <param name="http">The HTTP client used for requests.</param>
         /// <param name="resourcePath">The base resource path for the API endpoint.</param>
-        protected BaseCrudApi(HttpClient http, string resourcePath)
+        /// <param name="logger">An optional logger used to record API call outcomes.</param>
+#if NETFRAMEWORK
+        protected BaseCrudApi(HttpClient http, string resourcePath, ILogger logger = null)
+#else
+        protected BaseCrudApi(HttpClient http, string resourcePath, ILogger? logger = null)
+#endif
         {
             Http = http ?? throw new ArgumentNullException(nameof(http));
             ResourcePath = resourcePath ?? throw new ArgumentNullException(nameof(resourcePath));
+            Logger = logger;
         }
 
         /// <summary>
@@ -43,7 +59,7 @@ namespace ReC.Client.Api
             using (var content = ReCClientHelpers.ToJsonContent(payload))
             using (var resp = await Http.PostAsync(ResourcePath, content, cancel))
             {
-                await ReCClientHelpers.EnsureSuccessAsync(resp, cancel).ConfigureAwait(false);
+                await ReCClientHelpers.HandleResponseAsync(resp, Logger, cancel).ConfigureAwait(false);
             }
         }
 
@@ -60,7 +76,7 @@ namespace ReC.Client.Api
             using (var content = ReCClientHelpers.ToJsonContent(payload))
             using (var resp = await Http.PutAsync($"{ResourcePath}/{id}", content, cancel))
             {
-                await ReCClientHelpers.EnsureSuccessAsync(resp, cancel).ConfigureAwait(false);
+                await ReCClientHelpers.HandleResponseAsync(resp, Logger, cancel).ConfigureAwait(false);
             }
         }
 
@@ -79,7 +95,7 @@ namespace ReC.Client.Api
             })
             using (var resp = await Http.SendAsync(request, cancel))
             {
-                await ReCClientHelpers.EnsureSuccessAsync(resp, cancel).ConfigureAwait(false);
+                await ReCClientHelpers.HandleResponseAsync(resp, Logger, cancel).ConfigureAwait(false);
             }
         }
     }
diff --git a/src/ReC.Client/Api/CommonApi.cs b/src/ReC.Client/Api/CommonApi.cs
index aea3cdf..d66b01b 100644
--- a/src/ReC.Client/Api/CommonApi.cs
+++ b/src/ReC.Client/Api/CommonApi.cs
@@ -1,6 +1,7 @@
 using System.Net.Http;
 using System.Threading;
 using System.Threading.Tasks;
+using Microsoft.Extensions.Logging;
 
 namespace ReC.Client.Api
 {
@@ -13,7 +14,12 @@ namespace ReC.Client.Api
         /// Initializes a new instance of the <see cref="CommonApi"/> class.
         /// </summary>
         /// <param name="http">The HTTP client used for requests.</param>
-        public CommonApi(HttpClient http) : base(http, "api/Common")
+        /// <param name="logger">An optional logger used to record API call outcomes.</param>
+#if NETFRAMEWORK
+        public CommonApi(HttpClient http, ILogger logger = null) : base(http, "api/Common", logger)
+#else
+        public CommonApi(HttpClient http, ILogger? logger = null) : base(http, "api/Common", logger)
+#endif
         {
         }
     }
diff --git a/src/ReC.Client/Api/EndpointAuthApi.cs b/src/ReC.Client/Api/EndpointAuthApi.cs
index 287d6d0..14fb041 100644
--- a/src/ReC.Client/Api/EndpointAuthApi.cs
+++ b/src/ReC.Client/Api/EndpointAuthApi.cs
@@ -1,6 +1,7 @@
 using System.Net.Http;
 using System.Threading;
 using System.Threading.Tasks;
+using Microsoft.Extensions.Logging;
 
 namespace ReC.Client.Api
 {
@@ -13,7 +14,12 @@ namespace ReC.Client.Api
         /// Initializes a new instance of the <see cref="EndpointAuthApi"/> class.
         /// </summary>
         /// <param name="http">The HTTP client used for requests.</param>
-        public EndpointAuthApi(HttpClient http) : base(http, "api/EndpointAuth")
+        /// <param name="logger">An optional logger used to record API call outcomes.</param>
+#if NETFRAMEWORK
+        public EndpointAuthApi(HttpClient http, ILogger logger = null) : base(http, "api/EndpointAuth", logger)
+#else
+        public EndpointAuthApi(HttpClient http, ILogger? logger = null) : base(http, "api/EndpointAuth", logger)
+#endif
         {
         }
     }
diff --git a/src/ReC.Client/Api/EndpointParamsApi.cs b/src/ReC.Client/Api/EndpointParamsApi.cs
index ac7b781..f02224b 100644
--- a/src/ReC.Client/Api/EndpointParamsApi.cs
+++ b/src/ReC.Client/Api/EndpointParamsApi.cs
@@ -1,6 +1,7 @@
 using System.Net.Http;
 using System.Threading;
 using System.Threading.Tasks;
+using Microsoft.Extensions.Logging;
 
 namespace ReC.Client.Api
 {
@@ -13,7 +14,12 @@ namespace ReC.Client.Api
         /// Initializes a new instance of the <see cref="EndpointParamsApi"/> class.
         /// </summary>
         /// <param name="http">The HTTP client used for requests.</param>
-        public EndpointParamsApi(HttpClient http) : base(http, "api/EndpointParams")
+        /// <param name="logger">An optional logger used to record API call outcomes.</param>
+#if NETFRAMEWORK
+        public EndpointParamsApi(HttpClient http, ILogger logger = null) : base(http, "api/EndpointParams", logger)
+#else
+        public EndpointParamsApi(HttpClient http, ILogger? logger = null) : base(http, "api/EndpointParams", logger)
+#endif
         {
         }
     }
diff --git a/src/ReC.Client/Api/EndpointsApi.cs b/src/ReC.Client/Api/EndpointsApi.cs
index cc8634e..0d70339 100644
--- a/src/ReC.Client/Api/EndpointsApi.cs
+++ b/src/ReC.Client/Api/EndpointsApi.cs
@@ -1,6 +1,7 @@
 using System.Net.Http;
 using System.Threading;
 using System.Threading.Tasks;
+using Microsoft.Extensions.Logging;
 
 namespace ReC.Client.Api
 {
@@ -13,7 +14,12 @@ namespace ReC.Client.Api
         /// Initializes a new instance of the <see cref="EndpointsApi"/> class.
         /// </summary>
         /// <param name="http">The HTTP client used for requests.</param>
-        public EndpointsApi(HttpClient http) : base(http, "api/Endpoints")
+        /// <param name="logger">An optional logger used to record API call outcomes.</param>
+#if NETFRAMEWORK
+        public EndpointsApi(HttpClient http, ILogger logger = null) : base(http, "api/Endpoints", logger)
+#else
+        public EndpointsApi(HttpClient http, ILogger? logger = null) : base(http, "api/Endpoints", logger)
+#endif
         {
         }
     }
diff --git a/src/ReC.Client/Api/ProfileApi.cs b/src/ReC.Client/Api/ProfileApi.cs
index a2f6827..ea174e5 100644
--- a/src/ReC.Client/Api/ProfileApi.cs
+++ b/src/ReC.Client/Api/ProfileApi.cs
@@ -1,6 +1,7 @@
 using System.Net.Http;
 using System.Threading;
 using System.Threading.Tasks;
+using Microsoft.Extensions.Logging;
 
 namespace ReC.Client.Api
 {
@@ -13,7 +14,12 @@ namespace ReC.Client.Api
         /// Initializes a new instance of the <see cref="ProfileApi"/> class.
         /// </summary>
         /// <param name="http">The HTTP client used for requests.</param>
-        public ProfileApi(HttpClient http) : base(http, "api/Profile")
+        /// <param name="logger">An optional logger used to record API call outcomes.</param>
+#if NETFRAMEWORK
+        public ProfileApi(HttpClient http, ILogger logger = null) : base(http, "api/Profile", logger)
+#else
+        public ProfileApi(HttpClient http, ILogger? logger = null) : base(http, "api/Profile", logger)
+#endif
         {
         }
 
diff --git a/src/ReC.Client/Api/RecActionApi.cs b/src/ReC.Client/Api/RecActionApi.cs
index 53d9a20..6aed328 100644
--- a/src/ReC.Client/Api/RecActionApi.cs
+++ b/src/ReC.Client/Api/RecActionApi.cs
@@ -1,6 +1,7 @@
 using System.Net.Http;
 using System.Threading;
 using System.Threading.Tasks;
+using Microsoft.Extensions.Logging;
 
 namespace ReC.Client.Api
 {
@@ -13,7 +14,12 @@ namespace ReC.Client.Api
         /// Initializes a new instance of the <see cref="RecActionApi"/> class.
         /// </summary>
         /// <param name="http">The HTTP client used for requests.</param>
-        public RecActionApi(HttpClient http) : base(http, "api/RecAction")
+        /// <param name="logger">An optional logger used to record API call outcomes.</param>
+#if NETFRAMEWORK
+        public RecActionApi(HttpClient http, ILogger logger = null) : base(http, "api/RecAction", logger)
+#else
+        public RecActionApi(HttpClient http, ILogger? logger = null) : base(http, "api/RecAction", logger)
+#endif
         {
         }
 
@@ -30,7 +36,7 @@ namespace ReC.Client.Api
             using (content)
             using (var resp = await Http.PostAsync($"{ResourcePath}/invoke/{profileId}", content, cancellationToken))
             {
-                await ReCClientHelpers.EnsureSuccessAsync(resp, cancellationToken).ConfigureAwait(false);
+                await ReCClientHelpers.HandleResponseAsync(resp, Logger, cancellationToken).ConfigureAwait(false);
             }
         }
 
diff --git a/src/ReC.Client/Api/ResultApi.cs b/src/ReC.Client/Api/ResultApi.cs
index 37dca07..abced0c 100644
--- a/src/ReC.Client/Api/ResultApi.cs
+++ b/src/ReC.Client/Api/ResultApi.cs
@@ -1,6 +1,7 @@
 using System.Net.Http;
 using System.Threading;
 using System.Threading.Tasks;
+using Microsoft.Extensions.Logging;
 
 namespace ReC.Client.Api
 {
@@ -13,7 +14,12 @@ namespace ReC.Client.Api
         /// Initializes a new instance of the <see cref="ResultApi"/> class.
         /// </summary>
         /// <param name="http">The HTTP client used for requests.</param>
-        public ResultApi(HttpClient http) : base(http, "api/Result")
+        /// <param name="logger">An optional logger used to record API call outcomes.</param>
+#if NETFRAMEWORK
+        public ResultApi(HttpClient http, ILogger logger = null) : base(http, "api/Result", logger)
+#else
+        public ResultApi(HttpClient http, ILogger? logger = null) : base(http, "api/Result", logger)
+#endif
         {
         }