Magento 2.3.2. How do I change the default coupon error message?

Question

I just need to find where to change the 'This Coupon is not valid' message. I want to make it a bit more informative - "This Coupon is not valid. Please make sure you have registered an account, or that the coupon code is correct". I can find the coupon success message, but not this one.

Any pointers would be gratefully received. TIA

Answer 1

Magento check coupon code in vendor/magento/module-checkout/Controller/Cart/CouponPost.php

$this->messageManager->addErrorMessage(
                            __(
                                'The coupon code "%1" is not valid.',
                                $escaper->escapeHtml($couponCode)
                            )
                        );

And Magento translate coupon error message in en_US.csv.

vendor/magento/module-checkout/i18n/en_US.csv

Line num: 20

"The coupon code ""%1"" is not valid.","The coupon code ""%1"" is not valid."