Start webhook implementation

Model/Carrier/UData.php

@@ -20,4 +20,11 @@ class UData
      * @var string
      */
     public const RATES_ENDPOINT = 'https://api.dev.bobgo.co.za/rates-at-checkout/magento';
+
+    /**
+     * Order create/update webhook URL
+     *
+     * @var string
+     */
+    public const WEBHOOK_URL = 'https://api.dev.bobgo.co.za/webhook/channel/magento';
 }