vin.cs

public record RegisterVehicle(string Vin);

public class RegisterVehicleHandler
{
    private readonly IVinDecoderService _vinDecoderService;

    public RegisterVehicleHandler(IVinDecoderService vinDecoderService)
    {
        _vinDecoderService = vinDecoderService;
    }

    public async Task<string> Handle(RegisterVehicle command, CancellationToken cancellationToken)
    {
        var vinResult = await _vinDecoderService.Lookup(command.Vin, cancellationToken);
        
        // Do something with the result... save in DB. Whatever.
        
        return $"{vinResult.Year} {vinResult.Make} {vinResult.Model}";
    }
}