public string CancelamentoNFe(string request)
        {
            var loteRequest = new CancelamentoNFeRequest(1, request);
            var ret         = ((ISaoPauloServiceClient)this).CancelamentoNFe(loteRequest);

            return(ret.RetornoXML);
        }
 CancelamentoNFeResponse ISaoPauloServiceClient.CancelamentoNFe(CancelamentoNFeRequest request)
 {
     return(Channel.CancelamentoNFe(request));
 }