If you want help determining what rate to charge a customer, I built both JS and...

If you want help determining what rate to charge a customer, I built both JS and Python libraries that include functionality to:

  - Determine rate based on
    - phone number
    - billing address
    - self-declared location
    - IP address
  - Validate VAT IDs
  - Fetch exchange rate info from the European Central Bank

You can find the code at https://github.com/wbond/vat-moss.js and https://github.com/wbond/vat_moss-python.

I also wrote up a bit about dealing with registering for VAT MOSS, generating invoices, etc.