EuropeanVatInformationQuery Class

The European Value Added Tax Information Query class allow you to query European VAT entries directly with the EU registrar.

Namespace: Walter.Vat
Assembly: Walter.Vat (in Walter.Vat.dll)

Syntax

public static class EuropeanVatInformationQuery

Remarks

The query is cashing requests so that multiple requests are not going to generate requests against the VAT endpoint as to frequent requests and the VAT endpoint thinks you are doing a DOS attack

Examples

The bellow sample makes use of the County being of type GeoLocation. and uses that property to test if EU tax is applicable and if so validate if the VAT identifier is belonging to the company name provided.

This sample uses the location provided by the firewall framework using NuGet package Walter.Web.FireWall

This code is overly simplified but demonstrate how you could use this feature.

[HttpPost]
[ValidateAntiForgeryToken]
public async Task<IActionResult> ProcessOrder(Order model)
{
    if (!ModelState.IsValid)
        return View(model);

    if (model.Country.IsInTheEuropeanUnion())
    {
        var vies = await Walter.Vat.EuropeanVatInformationQuery.GetAsync(model.VATNumber).ConfigureAwait(false);
        if (!vies.IsValid || !vies.CompanyName.Equals(model.CompanyName, StringComparison.OrdinalIgnoreCase))
        {
            if (!vies.IsValid)
            {
                if (vies.Exception is null)
                {
                    _logger?.Lazy().LogWarning(vies.Exception, "Query European VAT failed with a for {vat} in {country}", model.VATNumber, model.Country);
                }
                else
                {
                    _logger?.Lazy().LogWarning(vies.Exception, "Query European VAT failed with a {exception} exception error {message}", vies.Exception.GetType().Name, vies.Exception.Message);
                }

                ModelState.AddModelError(nameof(model.VATNumber), "The VAT number is not valid");
            }

            if (!vies.CompanyName.Equals(model.CompanyName, StringComparison.OrdinalIgnoreCase))
            {
                ModelState.AddModelError(nameof(model.VATNumber), $"The VAT ID provided is belongs to another company than the one you specified, did you enter the wrong ID?");
                if (vies.CompanyName.Contains(model.CompanyName, StringComparison.OrdinalIgnoreCase))
                {
                    ModelState.AddModelError(nameof(model.CompanyName), $"The VAT number provided is belongs to {vies.CompanyName}, this sounds like {model.CompanyName} but you should update it to avoid complications.");
                }
                else
                {
                    ModelState.AddModelError(nameof(model.CompanyName), $"The VAT number provided is belongs to {vies.CompanyName} did you provide the wrong name?");
                }
            }

            return View(model);
        }
    }
}

EuropeanVatInformationQuery Class

Syntax

Remarks

Examples

See Also