code: def init_app(self, app, minters_entry_point_group=None,
                   fetchers_entry_point_group=None):
          
          self.init_config(app)
          # Initialize CLI
          app.cli.add_command(cmd)
  
          # Initialize logger
          app.config.setdefault('PIDSTORE_APP_LOGGER_HANDLERS', app.debug)
          if app.config['PIDSTORE_APP_LOGGER_HANDLERS']:
              for handler in app.logger.handlers:
                  logger.addHandler(handler)
  
          # Initialize admin object link endpoints.
          try:
              pkg_resources.get_distribution('invenio-records')
              app.config.setdefault('PIDSTORE_OBJECT_ENDPOINTS', dict(
                  rec='recordmetadata.details_view',
              ))
          except pkg_resources.DistributionNotFound:
              app.config.setdefault('PIDSTORE_OBJECT_ENDPOINTS', {})
  
          # Register template filter
          app.jinja_env.filters['pid_exists'] = pid_exists
  
          # Initialize extension state.
          state = _PIDStoreState(
              app=app,
              minters_entry_point_group=minters_entry_point_group,
              fetchers_entry_point_group=fetchers_entry_point_group,
          )
          app.extensions['invenio-pidstore'] = state
          return state
docs: Flask application initialization.
  
          Initialize:
  
          * The CLI commands.
  
          * Initialize the logger (Default: `app.debug`).
  
          * Initialize the default admin object link endpoint.
              (Default: `{"rec": "recordmetadata.details_view"}` if
              `invenio-records` is installed, otherwise `{}`).
  
          * Register the `pid_exists` template filter.
  
          * Initialize extension state.
  
          :param app: The Flask application
          :param minters_entry_point_group: The minters entry point group
              (Default: None).
          :param fetchers_entry_point_group: The fetchers entry point group
              (Default: None).
          :returns: PIDStore state application.