All optional address fields are now nullable

Author: Sander de Vos

src/Data/RecipientData.php

@@ -5,17 +5,17 @@
 class RecipientData extends Data
 {
     public string $name;
-    public string $company_name;
+    public ?string $company_name;
     public string $address;
-    public string $address_2;
+    public ?string $address_2;
     public ?string $house_number;
     public string $city;
     public string $postal_code;
-    public string $to_post_number;
+    public ?string $to_post_number;
     public string $country;
-    public string $country_state;
-    public string $telephone;
-    public string $email;
+    public ?string $country_state;
+    public ?string $telephone;
+    public ?string $email;
 
     public array $required = [
         'name',

src/Data/SenderData.php

@@ -5,15 +5,15 @@
 class SenderData extends Data
 {
     public string $from_name;
-    public string $from_company_name;
+    public ?string $from_company_name;
     public string $from_address_1;
-    public string $from_address_2;
+    public ?string $from_address_2;
     public ?string $from_house_number;
     public string $from_city;
     public string $from_postal_code;
     public string $from_country;
-    public string $from_telephone;
-    public string $from_email;
+    public ?string $from_telephone;
+    public ?string $from_email;
 
     public array $required = [
         'from_name',