diff --git a/src/AuthService.php b/src/AuthService.php
new file mode 100644
index 0000000..a232ad6
--- /dev/null
+++ b/src/AuthService.php
@@ -0,0 +1,38 @@
+<?php
+
+namespace Classid\SsoDriver;
+
+use Classid\SsoDriver\Exceptions\InvalidClientCredentials;
+use Classid\SsoDriver\Exceptions\InvalidRetryGenerateException;
+use Classid\SsoDriver\Exceptions\SSODriverException;
+use Classid\SsoDriver\Exceptions\UnknownErrorHandlerException;
+use Illuminate\Support\Facades\Http;
+
+class AuthService
+{
+    public MumtazSSOService $mumtazSSOService;
+    public function __construct()
+    {
+        $this->mumtazSSOService = new MumtazSSOService();
+    }
+
+    /**
+     * @param array $credentials
+     * @return mixed
+     * @throws InvalidClientCredentials
+     * @throws InvalidRetryGenerateException
+     * @throws SSODriverException
+     * @throws UnknownErrorHandlerException
+     */
+    public function authenticate(array $credentials): mixed
+    {
+        return $this->mumtazSSOService->setAuthorizationToken()
+            ->getResponse(function (MumtazSSOService $service) use ($credentials) {
+                return Http::withHeaders($service->getHeaders())->post($service->getBaseUrl() . "/api/v1/auth", [
+                    "username" => $credentials["username"],
+                    "password" => $credentials["password"],
+                    "institution_id" => $credentials["institution_id"], //todo : hardcode for integration testing
+                ]);
+            });
+    }
+}
diff --git a/src/Exceptions/SSODriverException.php b/src/Exceptions/SSODriverException.php
index e5eb7e8..b146a7c 100644
--- a/src/Exceptions/SSODriverException.php
+++ b/src/Exceptions/SSODriverException.php
@@ -8,14 +8,20 @@
 
 class SSODriverException extends Exception
 {
-    public array|null $data;
+    public array|null $errorResponse;
+
     public function __construct(string     $message = "Something went wrong !",
-                                ?array $data = [],
+                                ?array     $errorResponse = [],
                                 int        $code = Response::HTTP_UNAUTHORIZED,
                                 ?Throwable $previous = null
     )
     {
-        $this->data = $data;
+        $this->errorResponse = $errorResponse;
         parent::__construct($message, $code, $previous);
     }
+
+    public function getErrorResponse():?array
+    {
+        return $this->errorResponse;
+    }
 }
diff --git a/src/MumtazSSOService.php b/src/MumtazSSOService.php
index 529c345..c0f1701 100644
--- a/src/MumtazSSOService.php
+++ b/src/MumtazSSOService.php
@@ -116,7 +116,10 @@ public function getResponse(callable $request, callable $customErrorHandler = nu
                     continue;
                 }
 
-                $customErrorHandler($this, $response);
+
+                if ($customErrorHandler){
+                    $customErrorHandler($this, $response);
+                }
 
                 self::mappingErrorHandler($response->json()); //for default response
             }
diff --git a/src/Traits/SSOServiceErrorHandler.php b/src/Traits/SSOServiceErrorHandler.php
index 2dd4a47..393b6dd 100644
--- a/src/Traits/SSOServiceErrorHandler.php
+++ b/src/Traits/SSOServiceErrorHandler.php
@@ -32,6 +32,6 @@ public static function unknownResponseErrorHandler(?array $errorResponse): void
      */
     public static function mappingErrorHandler(?array $errorResponse): void
     {
-        throw new SSODriverException("Something went wrong", $errorResponse);
+        throw new SSODriverException($errorResponse["message"], $errorResponse);
     }
 }