Some customers in the US need to enter their post box number at the end of the Zip code in order to get a shipping quote from Marchants.com
E.g. The customer with this address couldn't proceed due to this issue.
294 Whittier Highway Route 25
Center Harbor, NH 03226
They should have entered the zip code in the following manner.
XXXX - stands for a numeric post box number such as 1234. Our shipping tool powered by UPS requires the postal code to process the address.
If they don't have a PO number, ask them to enter 0000 - four zeros i.e. 03226-0000 and process the order. When you process the order, make sure to remove the random postal code number and keep the actual zip codes only.