Title: Missing parameter for register_rest_route
Last modified: April 25, 2022

---

# Missing parameter for register_rest_route

 *  [Emre Erkan](https://wordpress.org/support/users/emre/)
 * (@emre)
 * [4 years, 1 month ago](https://wordpress.org/support/topic/missing-parameter-for-register_rest_route/)
 * As of WordPress 5.5, if register_rest_route omits `permission_callback` WordPress
   generates a notice. You can update the `iwp_woocommerce_shipment_rest()` function
   in `includes/woocommerce-shipment-tracking.php` as below:
 *     ```
       public function iwp_woocommerce_shipment_rest() {
   
               /* Initialize */
               register_rest_route( 'iwp/shipment-tracking/v1', '/initialize', array(
                   'methods' => 'POST',
                   'callback' => [$this, 'iwp_initialize'],
                   'permission_callback' => '__return_true',
               ) );
   
               /* Submit */
               register_rest_route( 'iwp/shipment-tracking/v1', '/submit', array(
                   'methods' => 'POST',
                   'callback' => [$this, 'iwp_submit'],
                   'permission_callback' => '__return_true',
               ) );
   
           }
       ```
   
 * [More info](https://make.wordpress.org/core/2020/07/22/rest-api-changes-in-wordpress-5-5/)
   about the notice
    -  This topic was modified 4 years, 1 month ago by [Emre Erkan](https://wordpress.org/support/users/emre/).

The topic ‘Missing parameter for register_rest_route’ is closed to new replies.

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 * 0 replies
 * 1 participant
 * Last reply from: [Emre Erkan](https://wordpress.org/support/users/emre/)
 * Last activity: [4 years, 1 month ago](https://wordpress.org/support/topic/missing-parameter-for-register_rest_route/)
 * Status: not resolved