Great question and sorry for the frustration you have experienced on our checkout page!
Please note, your Postal Code/Zip Code must be entered in 2 separate places on the checkout page: 1) Beside the CVC and 2) Directly beside the State field.
Please note, your Postal Code/Zip Code must be the code associated with the credit card being used. And, you must have entered the correct credit card number in the card number field below "Card details."
If you are still experiencing difficulty with your Postal Code/Zip Code, please email [email protected]
We hope this helps!