old-new-wiaas/backend/app/plugins/wiaas/includes/class-wiaas-api.php

<?php

/**
 * Wiaas API
 *
 * Handles wiaas API endpoint requests
 */

defined( 'ABSPATH' ) || exit;

/**
 * API class
 */
class Wiaas_API {

	public static function init() {

		if ( ! class_exists( 'WP_REST_Server' ) ) {
			return;
		}

		self::_rest_api_includes();

		// Init REST API routes.
		add_action( 'rest_api_init', array( __CLASS__, 'register_rest_routes' ), 10 );
	}

	/**
	 * Include REST API classes
	 */
	private static function _rest_api_includes() {

		#Delivery process controller
		include_once dirname( __FILE__ ) . '/api/class-wiaas-rest-delivery-process-api.php';
		include_once dirname( __FILE__ ) . '/api/class-wiaas-cart-api.php';
	}

	public static function register_rest_routes() {
		$controllers = array(
			'Wiass_REST_Delivery_Process_API',
			'Wiaas_Cart_API'
		);

		foreach ( $controllers as $controller ) {
			call_user_func(array($controller, 'register_routes'));
		}
	}
}

Wiaas_API::init();