Problem save with Tools :: getValue ('zone_text');

[ABdev88]

I have a problem with registering a custom field in the payment page:
I created files:

1. Payment_form.tpl

   <form action = "{$ link-> getModuleLink ('order_validate', 'validation', [], true) | escape: 'html'}" method = "POST">
   <label for = "zone_remarque"> Note </label>
   <input type = "text" name = "zone_remarque" id = "zone_remarque" /> 
   </form>

   
   2- in the validation.php controller
   I cannot retrieve the value of the text zone via: Tools :: getValue ('zone_remarque');
   
   Someone can help me please ?
   
   Thanks

Edited September 30, 2021 by ABdev88 (see edit history)

[squni]

To get this value you need to use:

$_POST['zone_remarque']