# Request Status Codes
For all requests, we will return an HTTP status code that indicates a success or the problem that has led to the failure.
A successful request will be returned with status code 200
# API Error Codes
# 401
Invalid authentication credentials
# 403
You are not allowed to use this endpoint, please upgrade your plan (opens new window).
# 404
A requested endpoint does not exist
# 422
Validation error, please check the list of validation errors: here
# 429
You have hit your rate limit or your monthly limit. For more requests please upgrade your plan (opens new window).
# 500
Internal Server Error - let us know: support@vatcheckapi.com
# 503
The countries VAT validation service is currently not available. You can retry the request at any point to check again.
# Validation errors
# Missing vat_number
The vat_number parameter is required
# Missing country_code
The country_code parameter is required, if the given vat_number has no country code.