add types

app/Models/Payment/ApiKeyHalkbank.php

@@ -30,7 +30,7 @@ class ApiKeyHalkbank extends Model
     /**
      * Generate unique order number
      */
-    public static function generateOrderNumber($resource): int
+    public static function generateOrderNumber(mixed $resource): int
     {
         $order_number = static::firstOrCreate([
             'billing_username' => $resource->billing_username ?? 'asdasd',
@@ -38,9 +38,9 @@ class ApiKeyHalkbank extends Model
         ], ['order_number' => '01122017270']);
 
         $order_number->update([
-            'order_number' => $order_number->order_number + 1,
+            'order_number' => intval($order_number->order_number) + 1,
         ]);
 
-        return $order_number->order_number;
+        return (int) $order_number->order_number;
     }
 }