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CheckVatService.cs

using Newtonsoft.Json;
using Nop.Core.Domain.Tax;
using Nop.Core.Http;

namespace Nop.Services.Tax;

/// 
/// Check vat service 
/// 
public partial class CheckVatService : ICheckVatService
{
    #region Fields

    protected readonly IHttpClientFactory _httpClientFactory;

    #endregion

    #region Ctor

    public CheckVatService(IHttpClientFactory httpClientFactory)
    {
        _httpClientFactory = httpClientFactory;
    }

    #endregion

    #region Methods

    /// 
    /// Try to validate VAT number
    /// 
    /// Two letter ISO code of a country
    /// The VAT number to check
    /// 
    /// A task that represents the asynchronous operation
    /// The task result contains the vAT Number status. Name (if received). Address (if received)
    /// 
    public async Task<(VatNumberStatus vatNumberStatus, string name, string address)> CheckVatAsync(string twoLetterIsoCode, string vatNumber)
    {
        var name = string.Empty;
        var address = string.Empty;

        //as of 01/01/2021, the VoW service to validate UK (GB) VAT numbers ceased to exist.
        //so we use hmrc.gov.uk API to validate UK VAT numbers.
        if (twoLetterIsoCode == "GB")
        {
            var client = _httpClientFactory.CreateClient(NopHttpDefaults.DefaultHttpClient);
            var result = await client.GetAsync(string.Format(NopTaxDefaults.UKVatValidateUrl, vatNumber));

            if (!result.IsSuccessStatusCode)
                return (VatNumberStatus.Invalid, name, address);

            var response = JsonConvert.DeserializeAnonymousType(await result.Content.ReadAsStringAsync(),
                new { target = new { name = string.Empty, address = new { line1 = string.Empty } } });

            if (response == null) 
                return (VatNumberStatus.Invalid, name, address);

            var target = response.target;
            name = target.name;
            address = target.address.line1;
        }
        else
        {
            //the service returns INVALID_INPUT for country codes that are not uppercase.
            twoLetterIsoCode = twoLetterIsoCode.ToUpperInvariant();

            var s = new EuropaCheckVatService.checkVatPortTypeClient();
            var result = await s.checkVatAsync(new EuropaCheckVatService.checkVatRequest
            {
                vatNumber = vatNumber,
                countryCode = twoLetterIsoCode
            });

            if (!result.valid)
                return (VatNumberStatus.Invalid, name, address);

            name = result.name;
            address = result.address;
        }

        return (VatNumberStatus.Valid, name, address);
    }

    #endregion
}