diff --git a/OpenHarbor.JwtTokenManager/JwtTokenManagerOptions.cs b/OpenHarbor.JwtTokenManager/JwtTokenManagerOptions.cs
index 3fa5c34..1c18320 100644
--- a/OpenHarbor.JwtTokenManager/JwtTokenManagerOptions.cs
+++ b/OpenHarbor.JwtTokenManager/JwtTokenManagerOptions.cs
@@ -6,5 +6,6 @@ public class JwtTokenManagerOptions
   public required string ClientId { get; set; }
   public required string ClientSecret { get; set; }
   public IEnumerable<string> Scopes { get; set; } = Array.Empty<string>();
+  public bool IsCredentialsInHeader { get; set; } = false;
 }
 
diff --git a/OpenHarbor.JwtTokenManager/JwtTokenManagerService.cs b/OpenHarbor.JwtTokenManager/JwtTokenManagerService.cs
index ceb1f02..f400758 100644
--- a/OpenHarbor.JwtTokenManager/JwtTokenManagerService.cs
+++ b/OpenHarbor.JwtTokenManager/JwtTokenManagerService.cs
@@ -1,5 +1,6 @@
 using System.Net.Http.Headers;
 using System.Net.Http.Json;
+using System.Text;
 using Microsoft.Extensions.Caching.Memory;
 using Microsoft.Extensions.Logging;
 using OpenHarbor.JwtTokenManager.Abstractions;
@@ -23,19 +24,33 @@ public class JwtTokenManagerService(JwtTokenManagerOptions options, IHttpClientF
         return cachedToken;
       }
     }
-    
-    var formContent = new FormUrlEncodedContent([
-      new KeyValuePair<string, string>("grant_type", "client_credentials"),
-      new KeyValuePair<string, string>("client_id", options.ClientId),
-      new KeyValuePair<string, string>("client_secret", options.ClientSecret),
-      new KeyValuePair<string, string>("scopes", string.Join(" ", _scopes))
-    ]);
+
+    var formContentKeyValues = new List<KeyValuePair<string, string>>()
+    {
+      new ("grant_type", "client_credentials"),
+      new ("scopes", string.Join(" ", _scopes))
+    };
+
+    if (options.IsCredentialsInHeader)
+    {
+      formContentKeyValues.AddRange([
+        new KeyValuePair<string, string>("client_id", options.ClientId),
+        new KeyValuePair<string, string>("client_secret", options.ClientSecret)
+      ]);
+    }
+    var formContent = new FormUrlEncodedContent(formContentKeyValues);
     
     var request = new HttpRequestMessage(HttpMethod.Post, options.TokenEndpoint)
     {
       Content = formContent
     };
     
+    if (false == options.IsCredentialsInHeader)
+    {
+      var credentials = Convert.ToBase64String(Encoding.ASCII.GetBytes($"{options.ClientId}:{options.ClientSecret}"));
+      request.Headers.Authorization = new AuthenticationHeaderValue("Basic", credentials);
+    }
+
     request.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
     
     var response = await _httpClient.SendAsync(request, cancellationToken);