public function get_collection_params() {
		$params                       = parent::get_collection_params();
		$params['context']['default'] = 'view';
		$boxes                        = array( 'sentbox', 'inbox' );

		if ( bp_is_active( 'messages', 'star' ) ) {
			$boxes[] = 'starred';
		}

		$params['box'] = array(
			'description'       => __( 'Filter the result by box.', 'buddypress' ),
			'default'           => 'inbox',
			'type'              => 'string',
			'enum'              => $boxes,
			'sanitize_callback' => 'sanitize_key',
			'validate_callback' => 'rest_validate_request_arg',
		);

		$params['type'] = array(
			'description'       => __( 'Filter the result by thread status.', 'buddypress' ),
			'default'           => 'all',
			'type'              => 'string',
			'enum'              => array( 'all', 'read', 'unread' ),
			'sanitize_callback' => 'sanitize_key',
			'validate_callback' => 'rest_validate_request_arg',
		);

		$params['user_id'] = array(
			'description'       => __( 'Limit result to messages created by a specific user.', 'buddypress' ),
			'default'           => bp_loggedin_user_id(),
			'type'              => 'integer',
			'required'          => true,
			'sanitize_callback' => 'absint',
			'validate_callback' => 'rest_validate_request_arg',
		);

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