vies library

Classes

Country: A country exposed by the package as a known VAT origin.
VatShape: Offline syntactic validation of VAT numbers.
ViesProvider: Entry point of the package. All operations are static - the class is not instantiable.
ViesValidationResponse: Result of a successful VAT validation, either from the VIES SOAP service or from a local shape check. source says which of the two answered.

RegexType: Which VAT-number regular expression to apply when ValidationLevel.regex or ValidationLevel.all is requested.
ValidationLevel: Granularity of validation performed by ViesProvider.validateVat.
ValidationSource: Where the answer carried by a ViesValidationResponse comes from.
ViesErrorCode: Enumeration of all error codes that can be reported by the VIES package.

defaultRequestTimeout → const Duration: Default timeout applied to a VIES call when the caller does not override it. It bounds one attempt, not a whole validateVat with retries.
europeanCountries → const List<Country>: Convenience list of European country codes the package may encounter when dealing with VAT numbers. This is not a strict list of EU member states - it includes EEA neighbours and a few other European territories that frequently appear in business directories.
maxRetryBackoff → const Duration: Upper bound on the exponential backoff between two retried attempts, so a large retries cannot turn into an unbounded wait.
viesServiceUrl → const String: Production endpoint of the VIES checkVat SOAP service.
viesTestServiceUrl → const String: Test endpoint of the VIES checkVat service - returns deterministic success/failure based on the VAT number tail, useful for integration testing without hitting the real database.

ViesClientError: Errors caused by the input or the parsed response (e.g. invalid VAT number, malformed SOAP body).
ViesError: Base class for every error raised by the vies package.
ViesServerError: Errors caused by the transport or by VIES itself (timeouts, faults, connectivity loss).