diff --git a/Models/Bill.php b/Models/Bill.php
index c00784b..5ed024f 100755
--- a/Models/Bill.php
+++ b/Models/Bill.php
@@ -414,7 +414,7 @@ class Bill implements \JsonSerializable
      * @var array
      * @since 1.0.0
      */
-    private array $vouchers = [];
+    public array $vouchers = [];
 
     /**
      * Tracking ids for shipping.
@@ -422,7 +422,7 @@ class Bill implements \JsonSerializable
      * @var array
      * @since 1.0.0
      */
-    private array $trackings = [];
+    public array $trackings = [];
 
     /**
      * Bill elements / bill lines.
diff --git a/Models/BillElement.php b/Models/BillElement.php
index 9292ad7..ed5a910 100755
--- a/Models/BillElement.php
+++ b/Models/BillElement.php
@@ -48,7 +48,7 @@ class BillElement implements \JsonSerializable
 
     public string $itemDescription = '';
 
-    protected int $quantity = 0;
+    public int $quantity = 0;
 
     public ?Subscription $subscription = null;
 
diff --git a/Models/BillType.php b/Models/BillType.php
index ecf20f6..10e0574 100755
--- a/Models/BillType.php
+++ b/Models/BillType.php
@@ -57,7 +57,7 @@ class BillType implements \JsonSerializable
      *
      * @var string|BaseStringL11n
      */
-    protected string | BaseStringL11n $l11n;
+    public string | BaseStringL11n $l11n;
 
     public bool $isTemplate = false;