diff --git a/Indicia.HubSpot/Core/Auth/HubSpotPrivateAppAccessTokenClientAuth.cs b/Indicia.HubSpot/Core/Auth/HubSpotPrivateAppAccessTokenClientAuth.cs
new file mode 100644
index 0000000..13116a2
--- /dev/null
+++ b/Indicia.HubSpot/Core/Auth/HubSpotPrivateAppAccessTokenClientAuth.cs
@@ -0,0 +1,29 @@
+using RestSharp;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Indicia.HubSpot.Core.Auth
+{
+    public class HubSpotPrivateAppAccessTokenClientAuth : IHubSpotClientAuth
+    {
+        private const string headerName = "authorization";
+        private readonly string _privateAppAccessToken;
+
+        private string headerValue => $"Bearer {_privateAppAccessToken}";
+
+        public HubSpotPrivateAppAccessTokenClientAuth(string privateAppAccessToken)
+        {
+            _privateAppAccessToken = privateAppAccessToken;
+        }
+        public Task ConfigureAuthAsync(IRestRequest request, CancellationToken cancellationToken = default)
+        {
+            request.AddHeader(headerName, headerValue);
+            return Task.CompletedTask;
+        }
+
+        public string AnonymizeUrl(string url)
+        {
+            return url;
+        }
+    }
+}