invokes TouchWorksMagicConstants.ACTION_GET_DOCUMENT_TYPE action
        :return: JSON response

def get_document_type(self, ehr_username, doc_type):
        """
        invokes TouchWorksMagicConstants.ACTION_GET_DOCUMENT_TYPE action
        :return: JSON response
        """
        magic = self._magic_json(
            action=TouchWorksMagicConstants.ACTION_GET_DOCUMENT_TYPE,
            app_name=self._app_name,
            user_id=ehr_username,
            token=self._token.token,
            parameter1=doc_type
        )
        response = self._http_request(TouchWorksEndPoints.MAGIC_JSON, data=magic)
        result = self._get_results_or_raise_if_magic_invalid(
            magic,
            response,
            TouchWorksMagicConstants.RESULT_GET_DOCUMENT_TYPE)
        return result