We have a customer who used the Express Checkout via Paypal in our store’s Checkout Page. They were not able to process their payment since after clicking the ‘Pay order’ button, the button turns into a loading spinner and then went back to ‘Pay order’ as if nothing happened - no redirect. I tried reproducing the issue and had the same problem. I checked the developer tools and realized that my card information in PayPal has missing details in my address. The payment then went through after addressing the concern by updating my information on PayPal itself.
Currently in our checkout page, there is no UI that displays these errors. The question now is, is it possible to display them in the Shopify checkout page? If so, where can we make these changes?