fix phpstan property does not accept string (#28574)

* fix phpstan property does not accept string

* fix phpstan property does not accept string

htdocs/stripe/class/stripe.class.php

@@ -1,5 +1,6 @@
 <?php
 /* Copyright (C) 2018-2021 	Thibault FOUCART       <support@ptibogxiv.net>
+ * Copyright (C) 2024       Frédéric France             <frederic.france@free.fr>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -48,6 +49,9 @@ class Stripe extends CommonObject
 	 */
 	public $id;
 
+	/**
+	 * @var string
+	 */
 	public $mode;
 
 	/**
@@ -55,11 +59,21 @@ class Stripe extends CommonObject
 	 */
 	public $entity;
 
+	/**
+	 * @var string
+	 */
 	public $statut;
 
 	public $type;
 
+	/**
+	 * @var string
+	 */
 	public $code;
+
+	/**
+	 * @var string
+	 */
 	public $declinecode;
 
 	/**