public function get_collection_params() {
		$params                       = parent::get_collection_params();
		$params['context']['default'] = 'view';

		// Remove the search argument.
		unset( $params['search'] );

		$params['order_by'] = array(
			'description'       => __( 'Name of the field to order according to.', 'buddypress' ),
			'default'           => 'id',
			'type'              => 'string',
			'enum'              => array( 'id', 'date_notified', 'item_id', 'secondary_item_id', 'component_name', 'component_action' ),
			'sanitize_callback' => 'sanitize_key',
			'validate_callback' => 'rest_validate_request_arg',
		);

		$params['sort_order'] = array(
			'description'       => __( 'Order sort attribute ascending or descending.', 'buddypress' ),
			'default'           => 'ASC',
			'type'              => 'string',
			'enum'              => array( 'ASC', 'DESC' ),
			'sanitize_callback' => 'sanitize_key',
			'validate_callback' => 'rest_validate_request_arg',
		);

		$params['component_name'] = array(
			'description'       => __( 'Limit result set to notifications associated with a specific component', 'buddypress' ),
			'default'           => '',
			'type'              => 'string',
			'sanitize_callback' => 'sanitize_text_field',
			'validate_callback' => 'rest_validate_request_arg',
		);

		$params['component_action'] = array(
			'description'       => __( 'Limit result set to notifications associated with a specific component\'s action name.', 'buddypress' ),
			'default'           => '',
			'type'              => 'string',
			'sanitize_callback' => 'sanitize_text_field',
			'validate_callback' => 'rest_validate_request_arg',
		);

		$params['user_id'] = array(
			'description'       => __( 'Limit result set to notifications addressed to a specific user.', 'buddypress' ),
			'default'           => bp_loggedin_user_id(),
			'type'              => 'integer',
			'sanitize_callback' => 'absint',
			'validate_callback' => 'rest_validate_request_arg',
		);

		$params['item_id'] = array(
			'description'       => __( 'Limit result set to notifications associated with a specific item ID.', 'buddypress' ),
			'default'           => 0,
			'type'              => 'integer',
			'sanitize_callback' => 'absint',
			'validate_callback' => 'rest_validate_request_arg',
		);

		$params['secondary_item_id'] = array(
			'description'       => __( 'Limit result set to notifications associated with a specific secondary item ID.', 'buddypress' ),
			'default'           => 0,
			'type'              => 'integer',
			'sanitize_callback' => 'absint',
			'validate_callback' => 'rest_validate_request_arg',
		);

		$params['is_new'] = array(
			'description'       => __( 'Limit result set to items from specific states.', 'buddypress' ),
			'default'           => true,
			'type'              => 'boolean',
			'sanitize_callback' => 'rest_sanitize_boolean',
			'validate_callback' => 'rest_validate_request_arg',
		);

		/**
		 * Filters the collection query params.
		 *
		 * @param array $params Query params.
		 */
		return apply_filters( 'bp_rest_notifications_collection_params', $params );
	}