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

  • Override this controller function and change your desired message vendor/magento/module-checkout/Controller/Cart/CouponPost.php
    – Dotsquares
    May 9, 2022 at 9:03
  • Try with en_US.csv "The coupon code ""%1"" is not valid.","The coupon code ""%1"" is not valid."
    – S.P
    May 9, 2022 at 10:01
  • vendor/magento/module-checkout/i18n/en_US.csv , update there and execute setup upgrade and deployment command for render changes in static file.
    – S.P
    May 9, 2022 at 10:02

1 Answer 1


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

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

And Magento translate coupon error message in en_US.csv.


Line num: 20

"The coupon code ""%1"" is not valid.","The coupon code ""%1"" is not valid."
  • Thank you all. I added the new line in the translate csv. That did the trick.
    – Andy
    May 16, 2022 at 15:32

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