diff --git a/src/Turnierplan.Adapter/TurnierplanClient.cs b/src/Turnierplan.Adapter/TurnierplanClient.cs
index 700b67b4..e469b8b3 100644
--- a/src/Turnierplan.Adapter/TurnierplanClient.cs
+++ b/src/Turnierplan.Adapter/TurnierplanClient.cs
@@ -39,13 +39,13 @@ public sealed class TurnierplanClient : IDisposable
     /// </remarks>
     public TurnierplanClient(HttpClient httpClient, TurnierplanClientOptions options)
     {
-        ArgumentException.ThrowIfNullOrWhiteSpace(options.ApiKey);
+        ArgumentException.ThrowIfNullOrWhiteSpace(options.ApiKeyId);
         ArgumentException.ThrowIfNullOrWhiteSpace(options.ApiKeySecret);
 
         _httpClient = httpClient;
         _httpClient.BaseAddress = options.ApplicationUri;
 
-        _httpClient.DefaultRequestHeaders.Add(ApiKeyIdHeaderName, options.ApiKey);
+        _httpClient.DefaultRequestHeaders.Add(ApiKeyIdHeaderName, options.ApiKeyId);
         _httpClient.DefaultRequestHeaders.Add(ApiKeySecretHeaderName, options.ApiKeySecret);
     }
 
diff --git a/src/Turnierplan.Adapter/TurnierplanClientOptions.cs b/src/Turnierplan.Adapter/TurnierplanClientOptions.cs
index 4b2fdd8d..b93c9cfc 100644
--- a/src/Turnierplan.Adapter/TurnierplanClientOptions.cs
+++ b/src/Turnierplan.Adapter/TurnierplanClientOptions.cs
@@ -9,12 +9,12 @@ public sealed record TurnierplanClientOptions
     /// Initializes a new instance of the <see cref="TurnierplanClientOptions"/> class with the specified options.
     /// </summary>
     /// <param name="applicationUri">The base URI of the turnierplan.NET instance that should be queried.</param>
-    /// <param name="apiKey">The id of the API key.</param>
+    /// <param name="apiKeyId">The id of the API key.</param>
     /// <param name="apiKeySecret">The secret of the API key.</param>
-    public TurnierplanClientOptions(Uri applicationUri, string apiKey, string apiKeySecret)
+    public TurnierplanClientOptions(Uri applicationUri, string apiKeyId, string apiKeySecret)
     {
         ApplicationUri = applicationUri;
-        ApiKey = apiKey;
+        ApiKeyId = apiKeyId;
         ApiKeySecret = apiKeySecret;
     }
 
@@ -22,10 +22,10 @@ public TurnierplanClientOptions(Uri applicationUri, string apiKey, string apiKey
     /// Initializes a new instance of the <see cref="TurnierplanClientOptions"/> class with the specified options.
     /// </summary>
     /// <param name="applicationUri">The base URI of the turnierplan.NET instance that should be queried.</param>
-    /// <param name="apiKey">The id of the API key.</param>
+    /// <param name="apiKeyId">The id of the API key.</param>
     /// <param name="apiKeySecret">The secret of the API key.</param>
-    public TurnierplanClientOptions(string applicationUri, string apiKey, string apiKeySecret)
-        : this(new Uri(applicationUri), apiKey, apiKeySecret)
+    public TurnierplanClientOptions(string applicationUri, string apiKeyId, string apiKeySecret)
+        : this(new Uri(applicationUri), apiKeyId, apiKeySecret)
     {
     }
 
@@ -37,7 +37,7 @@ public TurnierplanClientOptions(string applicationUri, string apiKey, string api
     /// <summary>
     /// The id of the API key.
     /// </summary>
-    public string ApiKey { get; }
+    public string ApiKeyId { get; }
 
     /// <summary>
     /// The secret of the API key.