I changed the code in USPS.vb (in the dll)
from:
If LCase(objShippingDetails.RecipientsAddress.CountryIsoCode) <> "us" Then
url = "?API=IntlRateV2&XML=<IntlRateV2Request USERID=""{0}""><Package ID=""0""><Pounds>{1}</Pounds><Ounces>{2}</Ounces><Machinable>{3}</Machinable><MailType>{4}</MailType><ValueOfContents>{5}</ValueOfContents><Country>{7}</Country><Container>{6}</Container><Size>{8}</Size><Width>{9}</Width><Length>{10}</Length><Height>{11}</Height><Girth>{12}</Girth></Package></IntlRateV2Request>"
Else
url = "?API=RateV4&XML=<RateV4Request USERID=""{0}""><Revision/><Package ID=""0""><Service>{1}</Service><ZipOrigination>{2}</ZipOrigination><ZipDestination>{3}</ZipDestination><Pounds>{4}</Pounds><Ounces>{5}</Ounces><Container>{6}</Container><Size>{8}</Size><Width>{9}</Width><Length>{10}</Length><Height>{11}</Height><Girth>{12}</Girth><Machinable>{7}</Machinable><ReturnLocations></ReturnLocations><ReturnServiceInfo></ReturnServiceInfo><ShipDate>{13}</ShipDate></Package></RateV4Request>"
End If
to
If LCase(objShippingDetails.RecipientsAddress.CountryIsoCode) <> "us" Then
If LCase(objShippingDetails.RecipientsAddress.CountryIsoCode) = "ca" Then
url = "?API=IntlRateV2&XML=<IntlRateV2Request USERID=""{0}""><Revision>2</Revision><Package ID=""0""><Pounds>{1}</Pounds><Ounces>{2}</Ounces><Machinable>{3}</Machinable><MailType>{4}</MailType><ValueOfContents>{5}</ValueOfContents><Country>{7}</Country><Container>{6}</Container><Size>{8}</Size><Width>{9}</Width><Length>{10}</Length><Height>{11}</Height><Girth>{12}</Girth><OriginZip>11219</OriginZip></Package></IntlRateV2Request>"
Else
url = "?API=IntlRateV2&XML=<IntlRateV2Request USERID=""{0}""><Package ID=""0""><Pounds>{1}</Pounds><Ounces>{2}</Ounces><Machinable>{3}</Machinable><MailType>{4}</MailType><ValueOfContents>{5}</ValueOfContents><Country>{7}</Country><Container>{6}</Container><Size>{8}</Size><Width>{9}</Width><Length>{10}</Length><Height>{11}</Height><Girth>{12}</Girth></Package></IntlRateV2Request>"
End If
Else
url = "?API=RateV4&XML=<RateV4Request USERID=""{0}""><Revision/><Package ID=""0""><Service>{1}</Service><ZipOrigination>{2}</ZipOrigination><ZipDestination>{3}</ZipDestination><Pounds>{4}</Pounds><Ounces>{5}</Ounces><Container>{6}</Container><Size>{8}</Size><Width>{9}</Width><Length>{10}</Length><Height>{11}</Height><Girth>{12}</Girth><Machinable>{7}</Machinable><ReturnLocations></ReturnLocations><ReturnServiceInfo></ReturnServiceInfo><ShipDate>{13}</ShipDate></Package></RateV4Request>"
End If