vat_invalid

VAT invalid. The HTTP status depends on the call.

The order was refused because the VAT number could not be validated.

What to do

Check the VAT number in clientData.vatNumber. You can test a number first with POST /api/v2/me/vat/validate, which takes vatNumber and countryCode.

Branch on code, not on title or detail. When you contact support about it, include the requestId. More in Errors and retries.