wip: continue implementation

src/BusProNet/Model/Communication.php

@@ -7,6 +7,7 @@ class Communication
     public ?string $phone = null;
     public ?string $mobile = null;
     public ?string $email = null;
+    public bool $newsletter = false;
 
     public function toPayload(): array
     {
@@ -14,6 +15,7 @@ class Communication
             'email' => $this->email,
             'telefonmobil' => $this->mobile,
             'telefonprivat' => $this->phone,
+            'newsletter' => $this->newsletter ? 'True' : 'False',
         ];
     }
 }