We shipped from WA to CN via courier pickup; Invoiced to MA; Third party freight bill-to TX.
The problem is that Avalara TAXED this shipment apparently based on 1st 5 digits of postal code, at VA rate of 6%, even though it is CHINA (Country code CH (s/b CN), State code PC)
When sending international calculations to Avatax please be sure to use the correct country code.
If you are not sure what the correct country code is please look up the county in questions ISO code via a simple Google or Wikipedia search.
Customer used CH instead of the correct country code for China which is CN