diff --git a/office-alexander-logistics-app/pom.xml b/office-alexander-logistics-app/pom.xml
index c3fe427..83af5bb 100644
--- a/office-alexander-logistics-app/pom.xml
+++ b/office-alexander-logistics-app/pom.xml
@@ -398,12 +398,14 @@
 		</dependency>
 
 
+		<!-- KSeF 2.0 Client -->
 		<dependency>
-			<groupId>org.keycloak</groupId>
-			<artifactId>keycloak-authz-client</artifactId>
-			<version>26.0.4</version>
+			<groupId>io.alapierre.ksef-sdk</groupId>
+			<artifactId>ksef-client</artifactId>
+			<version>2.1.8</version>
 			<scope>test</scope>
 		</dependency>
 
+
 	</dependencies>
 </project>
\ No newline at end of file
diff --git a/office-alexander-logistics-app/src/test/java/com/alexanderlogistics/ksef/Params.java b/office-alexander-logistics-app/src/test/java/com/alexanderlogistics/ksef/Params.java
new file mode 100644
index 0000000..37bdf5b
--- /dev/null
+++ b/office-alexander-logistics-app/src/test/java/com/alexanderlogistics/ksef/Params.java
@@ -0,0 +1,13 @@
+package com.alexanderlogistics.ksef;
+
+public class Params {
+    public static final String TOKEN = "20251113-EC-2751AC3000-5C5466924B-62|nip-9552521552|fc0c95d020dc45d4af491fb0aa755f3f3f674b33ecbf4250a88ea6e36fa8340b";
+    public static final String TOKENx = "20251113-EC-2751AC3000-5C5466924B-62.nip-9552521552.fc0c95d020dc45d4af491fb0aa755f3f3f674b33ecbf4250a88ea6e36fa8340b";
+    public static final String NIP = "9552521552";
+
+    public static String getEncodedToken() {
+        String result = java.util.Base64.getEncoder().encodeToString(Params.TOKEN.getBytes());
+
+        return result;
+    }
+}
diff --git a/office-alexander-logistics-app/src/test/java/com/alexanderlogistics/ksef/TestKSeF.java b/office-alexander-logistics-app/src/test/java/com/alexanderlogistics/ksef/TestKSeF.java
new file mode 100644
index 0000000..56a5a6c
--- /dev/null
+++ b/office-alexander-logistics-app/src/test/java/com/alexanderlogistics/ksef/TestKSeF.java
@@ -0,0 +1,124 @@
+package com.alexanderlogistics.ksef;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.net.URI;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+import java.util.logging.Logger;
+
+import org.imixs.workflow.exceptions.ModelException;
+import org.imixs.workflow.exceptions.PluginException;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.MethodOrderer;
+import org.junit.jupiter.api.Order;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.TestMethodOrder;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+/**
+ * Test cases KSeF Interface
+ *
+ *
+ * @author rsoika
+ */
+@TestMethodOrder(MethodOrderer.OrderAnnotation.class)
+public class TestKSeF {
+
+    final static String ENCODING = "UTF-8";
+
+    private static Logger logger = Logger.getLogger(TestKSeF.class.getName());
+
+    // Configuration - replace with your actual values
+    private static final String KSEF_TEST_URL = "https://ksef-test.mf.gov.pl/api/v2";
+    // https://ksef-test.mf.gov.pl/api/v2/auth/challenge
+
+    private static HttpClient httpClient;
+    private static String challenge; // Static variable to share between tests
+
+    private final ObjectMapper objectMapper = new ObjectMapper();
+
+    @BeforeAll
+    public static void setupClass() {
+        logger.info("=== KSeF 2.0 Client Test ===");
+        logger.info("KSeF URL: " + KSEF_TEST_URL);
+        logger.info("NIP: " + Params.NIP);
+
+        httpClient = HttpClient.newBuilder()
+                .version(HttpClient.Version.HTTP_2)
+                .build();
+    }
+
+    @BeforeEach
+    public void setup() throws PluginException, ModelException {
+        logger.info("setup test environment ...");
+    }
+
+    @Test
+    @Order(1)
+    @DisplayName("Einfacher Challenge test 2.0 API")
+    public void testChallenge() throws Exception {
+        HttpRequest request = HttpRequest.newBuilder()
+                .uri(URI.create(KSEF_TEST_URL + "/auth/challenge")) // nur Endpoint checken
+                .header("Accept", "application/json")
+                .POST(HttpRequest.BodyPublishers.noBody()) //
+                .build();
+
+        HttpResponse<String> response = httpClient.send(request, HttpResponse.BodyHandlers.ofString());
+
+        System.out.println("Status: " + response.statusCode());
+        System.out.println("Response: " + response.body());
+
+        // Prüfen, dass wir eine API-Antwort bekommen, kein HTML
+        assertTrue(response.statusCode() < 500, "API sollte antworten, Status < 500");
+        assertFalse(response.body().contains("<html>"), "Response sollte keine HTML-Seite sein");
+
+        // Challenge aus Response extrahieren und speichern
+        if (response.statusCode() == 200) {
+            JsonNode jsonNode = objectMapper.readTree(response.body());
+            challenge = jsonNode.get("challenge").asText();
+            logger.info("Extracted challenge: " + challenge);
+        }
+    }
+
+    @Test
+    @Order(2)
+    @DisplayName("KSeF Token Request")
+    public void testKsefToken() throws Exception {
+        // JSON Payload erstellen
+
+        String jsonPayload = String.format(
+                "{" +
+                        "\"challenge\": \"%s\"," +
+                        "\"contextIdentifier\": {" +
+                        "    \"type\": \"Nip\"," +
+                        "    \"value\": \"%s\"" +
+                        "}," +
+                        "\"encryptedToken\": \"%s\"" +
+                        "}",
+                challenge, Params.NIP, Params.getEncodedToken());
+
+        HttpRequest request = HttpRequest.newBuilder()
+                .uri(URI.create(KSEF_TEST_URL + "/auth/ksef-token"))
+                .header("Accept", "application/json")
+                .header("Content-Type", "application/json")
+                .POST(HttpRequest.BodyPublishers.ofString(jsonPayload))
+                .build();
+
+        HttpResponse<String> response = httpClient.send(request, HttpResponse.BodyHandlers.ofString());
+
+        System.out.println("Status: " + response.statusCode());
+        System.out.println("Response: " + response.body());
+
+        // Prüfen, dass wir eine API-Antwort bekommen
+        assertTrue(response.statusCode() < 500, "API sollte antworten, Status < 500");
+        assertFalse(response.body().contains("<html>"), "Response sollte keine HTML-Seite sein");
+    }
+
+}