Handling Ajax Errors in JS

public bool HasError()
    {
        int responseCode = (int)StatusCode;
        return responseCode >= 400;
    }

PaymentResponse response = _networking.SendRequest(request);
    PaymentValidationResult result = PaymentValidationResult.Success;
    if (response.StatusCode.Is(400))
    {
        result = PaymentValidationResult.Failure;
    }
    else if (response.HasError())
    {
        result = PaymentValidationResult.Error;
    }

    return result;