code: def get_configurations(self, project, repository_type=None, repository_id=None, branch=None, service_connection_id=None):
          
          route_values = {}
          if project is not None:
              route_values['project'] = self._serialize.url('project', project, 'str')
          query_parameters = {}
          if repository_type is not None:
              query_parameters['repositoryType'] = self._serialize.query('repository_type', repository_type, 'str')
          if repository_id is not None:
              query_parameters['repositoryId'] = self._serialize.query('repository_id', repository_id, 'str')
          if branch is not None:
              query_parameters['branch'] = self._serialize.query('branch', branch, 'str')
          if service_connection_id is not None:
              query_parameters['serviceConnectionId'] = self._serialize.query('service_connection_id', service_connection_id, 'str')
          response = self._send(http_method='GET',
                                location_id='8fc87684-9ebc-4c37-ab92-f4ac4a58cb3a',
                                version='5.1-preview.1',
                                route_values=route_values,
                                query_parameters=query_parameters)
          return self._deserialize('[ConfigurationFile]', self._unwrap_collection(response))
docs: GetConfigurations.
          [Preview API] Gets a list of existing configuration files for the given repository.
          :param str project: Project ID or project name
          :param str repository_type: The type of the repository such as GitHub, TfsGit (i.e. Azure Repos), Bitbucket, etc.
          :param str repository_id: The vendor-specific identifier or the name of the repository, e.g. Microsoft/vscode (GitHub) or e9d82045-ddba-4e01-a63d-2ab9f040af62 (Azure Repos)
          :param str branch: The repository branch where to look for the configuration file.
          :param str service_connection_id: If specified, the ID of the service endpoint to query. Can only be omitted for providers that do not use service endpoints, e.g. TfsGit (i.e. Azure Repos).
          :rtype: [ConfigurationFile]