fix: apply correct return type and response handling

src/BusProNet/ApiClient.php

@@ -9,7 +9,7 @@ use App\BusProNet\Model\BaseData;
 use App\BusProNet\Model\Booking;
 use App\BusProNet\Model\BookingResponse;
 use App\BusProNet\Model\BookingUpdate;
-use App\BusProNet\Model\ContactFormResponse;
+use App\BusProNet\Model\RegistrationResponse;
 use App\BusProNet\Model\CrmAttributes;
 use App\BusProNet\Model\Notification;
 use App\BusProNet\Model\PersonalData;
@@ -79,7 +79,7 @@ class ApiClient
     /**
      * @throws ApiClientException
      */
-    public function register(RegistrationDto $registrationData): Notification
+    public function register(RegistrationDto $registrationData): Notification|RegistrationResponse
     {
         $data = [
             'user' => $this->config['bpn_username'],
@@ -144,7 +144,7 @@ class ApiClient
     public function createAddress(
         PersonalData $personalData,
         bool $debug = false,
-    ): ContactFormResponse|Notification {
+    ): RegistrationResponse|Notification {
         $data = [
             'user' => $this->config['bpn_username'],
             'key' => $this->createKey($this->config['bpn_username'], $this->config['bpn_password'], static::TYPE_CUSTOMER_DATA),