We have found out recently that anyone attempting to checkout internationally is not able to. The message we're getting back from USPS is that there is no dimensions, but we don't see a way to add dimensions to our products in zen-cart. Is anyone able to help us with this?

RAW XML FROM USPS:

SimpleXMLElement Object
(
[Package] => SimpleXMLElement Object
(
[@attributes] => Array
(
[ID] => 0
)

[Error] => SimpleXMLElement Object
(
[Number] => -2147219059
[Source] => ;IntlRateV2.ProcessRequest
[Description] => Invalid Dimensions. Length, Height, and Width are required.
[HelpFile] => SimpleXMLElement Object