vin.cs

public interface IVinDecoderService
{
    Task<VinDecoderResult> Lookup(string vin, CancellationToken cancellationToken = default);
}

public class VinDecoderService : IVinDecoderService
{
    private readonly HttpClient _httpClient;

    public VinDecoderService(HttpClient httpClient)
    {
        _httpClient = httpClient;
    }

    public async Task<VinDecoderResult> Lookup(string vin, CancellationToken cancellationToken = default)
    {
        var response = await _httpClient.SendAsync(new HttpRequestMessage
        {
            Method = HttpMethod.Get,
            RequestUri = new Uri($"https://api.vindecoder.com/{vin}/specs")
        }, cancellationToken);


        if (!response.IsSuccessStatusCode)
        {
            throw new Exception("Error calling API to decode VIN");
        }

        var result = await response.Content.ReadFromJsonAsync<VinDecoderResult>(cancellationToken: cancellationToken);
        return result ?? throw new Exception("Error calling API to decode VIN");
    }
}