diff --git a/services/resourcemanager/src/main/java/cloud/stackit/sdk/resourcemanager/api/DefaultApi.java b/services/resourcemanager/src/main/java/cloud/stackit/sdk/resourcemanager/api/DefaultApi.java
index 19e9bda..6ca7519 100644
--- a/services/resourcemanager/src/main/java/cloud/stackit/sdk/resourcemanager/api/DefaultApi.java
+++ b/services/resourcemanager/src/main/java/cloud/stackit/sdk/resourcemanager/api/DefaultApi.java
@@ -41,7 +41,8 @@
 import java.util.List;
 import java.util.Map;
 
-public class DefaultApi {
+// Package-private access to enforce service-specific API usage (DefaultApi => <ServiceName>Api)
+class DefaultApi {
 	private ApiClient localVarApiClient;
 	private int localHostIndex;
 	private String localCustomBaseUrl;
diff --git a/services/resourcemanager/src/main/java/cloud/stackit/sdk/resourcemanager/api/ResourceManagerApi.java b/services/resourcemanager/src/main/java/cloud/stackit/sdk/resourcemanager/api/ResourceManagerApi.java
new file mode 100644
index 0000000..c48b804
--- /dev/null
+++ b/services/resourcemanager/src/main/java/cloud/stackit/sdk/resourcemanager/api/ResourceManagerApi.java
@@ -0,0 +1,14 @@
+package cloud.stackit.sdk.resourcemanager.api;
+
+import cloud.stackit.sdk.core.config.CoreConfiguration;
+import java.io.IOException;
+
+public class ResourceManagerApi extends DefaultApi {
+	public ResourceManagerApi() throws IOException {
+		super();
+	}
+
+	public ResourceManagerApi(CoreConfiguration configuration) throws IOException {
+		super(configuration);
+	}
+}