code: def provisioning_uri(self, name, issuer_name=None):
          
          return utils.build_uri(self.secret, name, issuer_name=issuer_name)
docs: Returns the provisioning URI for the OTP
          This can then be encoded in a QR Code and used
          to provision the Google Authenticator app
          @param [String] name of the account
          @return [String] provisioning uri