Código Delphi [-]
procedure TGestionSII_1_1EnviarDatCli.HTTPRIOBeforePost(const HTTPReqResp: THTTPReqResp; Client: THTTPClient);//Data: Pointer);
var
  Store : IStore;
  Certs : ICertificates;
  Cert : ICertificate2;
  CertContext : ICertContext;
  PCertContext : PCCERT_CONTEXT;
  vNombreCertificado: OleVariant;
const
  INTERNET_OPTION_CLIENT_CERT_CONTEXT = 84;
begin
  vNombreCertificado:= HdParam(parSfnCertificadoNombreSII).AsString;
  Store := CoStore.Create;
  Store.Open(CAPICOM_CURRENT_USER_STORE, 'MY', CAPICOM_STORE_OPEN_MAXIMUM_ALLOWED );
  Certs:=Store.Certificates.Find(CAPICOM_CERTIFICATE_FIND_SUBJECT_NAME, vNombreCertificado, False ); { Buscar certificado por nombre }
  if Certs.Count > 0 then
  begin
    Cert := IInterface(Certs.Item[1]) as ICertificate2;
    CertContext := Cert as ICertContext;
    CertContext.Get_CertContext(Integer(PCertContext));
//    if not InternetSetOption(Data, INTERNET_OPTION_CLIENT_CERT_CONTEXT, PCertContext, Sizeof(CERT_CONTEXT)) then
    if not InternetSetOption(Client, INTERNET_OPTION_CLIENT_CERT_CONTEXT, PCertContext, Sizeof(CERT_CONTEXT)) then
      BoxMsg('Error, Internet SSL certificate');
  end else
    BoxMsg('Error, NO HAY CERTIFICADO');
end;