Added the COUPON_CLEAR_ALL event, and a route to trigger it.

local/modules/Front/Config/front.xml

@@ -160,6 +160,11 @@
         <default key="_view">order-invoice</default>
     </route>
 
+    <route id="order.coupon.clear" path="/order/clear-coupons">
+        <default key="_controller">Front\Controller\CouponController::clearAllCouponsAction</default>
+        <default key="_view">order-invoice</default>
+    </route>
+
     <route id="order.payment.process" path="/order/pay">
         <default key="_controller">Front\Controller\OrderController::pay</default>
     </route>

local/modules/Front/Controller/CouponController.php

@@ -40,9 +40,16 @@ use Thelia\Module\Exception\DeliveryException;
  */
 class CouponController extends BaseFrontController
 {
+    /**
+     * Clear all coupons.
+     */
+    public function clearAllCouponsAction() {
+        // Dispatch Event to the Action
+        $this->getDispatcher()->dispatch(TheliaEvents::COUPON_CLEAR_ALL);
+    }
 
     /**
-     * Test Coupon consuming
+     * Coupon consuming
      */
     public function consumeAction()
     {