Adjust to changes in API

public/typo3conf/ext/ep_theme/Classes/Form/BpnApiFinisher.php

@@ -27,7 +27,7 @@ class BpnApiFinisher extends AbstractFinisher
     {
         $formValues = $this->finisherContext->getFormValues();
         $addressData = [
-            'name' => $formValues['name'],
+            'lastName' => $formValues['name'],
             'firstName' => $formValues['vorname'],
             'gender' => $formValues['geschlecht'],
             'email' => $formValues['email'],

public/typo3conf/ext/ep_theme/Classes/Service/BookingApiService.php

@@ -46,9 +46,7 @@ class BookingApiService implements SingletonInterface
                 'headers' => [
                     'X-AUTH-TOKEN' => $this->apiToken,
                 ],
-                'body' => [
-                    'data' => $addressData,
-                ],
+                'body' => $addressData,
             ]);
         }
         catch (TransportExceptionInterface $e)