code: def get(self, sid):
          
          return CredentialContext(
              self._version,
              account_sid=self._solution['account_sid'],
              credential_list_sid=self._solution['credential_list_sid'],
              sid=sid,
          )
docs: Constructs a CredentialContext
  
          :param sid: The unique id that identifies the resource to fetch.
  
          :returns: twilio.rest.api.v2010.account.sip.credential_list.credential.CredentialContext
          :rtype: twilio.rest.api.v2010.account.sip.credential_list.credential.CredentialContext