Message Processing

The following table lists the possible responses to a validation request:

Response	Description
`tax-number-validation-not-available`	The service was not able to validate this number.
`tax-number-syntax-valid`	The syntax of the ID is valid. However, no further validations were done. For some countries, it can also involve a check sum validation.
`tax-number-syntax-invalid`	The syntax of the ID is invalid.
`tax-number-valid-according-to-external-service`	The Tax ID has been validated against the external service's list of Tax IDs and is valid.
`tax-number-invalid-according-to-external-service`	The Tax ID has been validated against the external service's database of Tax IDs and is invalid.
`tax-number-service-temporarily-unavailable`	Could not connect to validation service due to temporary unavailability of the service.
`tax-number-syntax-considered-valid-but-not-verified`	This message can occur due to the same reasons as the `tax-number-service-temporarily-unavailable` message. The difference here is that this message occurs when the `on-error` settings are used.