On my magento 2.4 I have a few coupon codes that should only be available to the admins via backend, which means that the customers on the frontend should not be able to use them. I was able to achieve this for the coupon block on the cart page by creating a Plugin on the \Magento\Checkout\Controller\Cart\CouponPost::execute() method. This method, however, doesnt work for the coupon block on the checkout page.

What I do on the cart page is:

  • check the coupon code entered by the user
  • if the coupon code is one of the restricted coupon codes
  • then removes the coupon from the cart and shows an "invalid code" error message to the user

How can I do the same on the checkout page? So when the user inserts the restricted coupon and clicks apply, I need to be able to not apply that coupon and send an error message instead

  • Have you found any solution yet? If yes then can you please post it here as the answer? Commented Apr 6, 2023 at 7:22
  • Sorry for the late reply.. actually yes, I did it, although i don't quite remember how.. let me review my code, I'll post an answer as soon as I can
    – Lou Nik
    Commented Apr 6, 2023 at 9:05
  • Sure @Lou Nik, it will be a great help. Thanks in Advance. Commented Apr 6, 2023 at 9:50

1 Answer 1


Sorry for the late reply.. what i ended up doing is creating a mixin for the Magento_SalesRule/js/view/payment/discount. So:

  • Vendor/Module/view/frontend/requirejs-config.js
var config = {
    config: {
        mixins: {
            'Magento_SalesRule/js/view/payment/discount': {
                'Vendor_Module/js/view/payment/discount-mixin': true
  • Vendor/Module/view/frontend/web/js/view/payment/discount-mixin.js
define(function() {
    'use strict';
    return function(target) {
        return target.extend({
            apply: function () {
                var tempCouponCode = JSON.stringify(this.couponCode());
                if( tempCouponCode.toLowerCase().indexOf($restrictedCouponCode) === -1 
                ) {
                        return this._super(); // calls the original method

Hope it helps

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