Capital One Shopping barcode scanning issue in Safari on Walmart

I want to scan a discount offered from Capital One Shopping when I placed on Walmart and it says receive $25 bonus with using Saftari and enabling Captial One extension but when I try to scan it goes to Google. Below says insert image but I receive error message that says must contain text when I clicked on add image

en you but extenstion on Safari and scan the barcode but even though I and Apple apand not Google

[Edited by Moderator]