Stop checkout process if address doesn't validate.

Hello,

We had a customer checkout without the added shipping charge because their address didn't validate with USPS. The customer entered the wrong zip code and they were warned via a message in blue at the top of the page that the address could not be validated. Instead of forcing the customer to enter the appropriate zip code they were given a checkout button. They promptly checked out and were not charged shipping. Is there some way I can change this?

Thanks,

Dawn

Hello,

Here is the error message upon entering the wrong zip code:



USPS error: -2147219401 Error Information: The Destination ZIP Code you have entered is invalid.
Failed to obtain shipping quotes.
USPS error: -2147219401 Error Information: The Destination ZIP Code you have entered is invalid.
Failed to obtain shipping quotes.

And here is a screenshot to show that the customer can still checkout:
screencast.com/t/Bw2YH7UEtJc

Website:
www.collinsvermontmaple.com
Edition: Basic

Yes,

The shipping tab has always been in place in the checkout workflow: screencast.com/t/CHRFB6iH8 so this doesn't seem to be the issue unless it's in the wrong order?

Best,

Dawn