call function wp admin plugin through ajax jquery

vinarticlepost_plugin.php

<?php
  
/*
 
Plugin Name: VIN Articles Post
 
Plugin URI: https://www.vinpractice.com/
 
Description: Sync / import CDP articles from VIN Api
 
Version: 1.0.1
 
Author: VIN Practice
 
Author URI: https://www.vinpractice.com/
 
License: GPLv2 or later
 
*/

if ( ! class_exists( 'VinArticlePost' ) ) {

	// plugin definitions 
	define( 'VAP_PLUGIN', '/vin-article-post/');

	// directory define
	define( 'VAP_PLUGIN_DIR', WP_PLUGIN_DIR.VAP_PLUGIN);
	define( 'VAP_INCLUDES_DIR', VAP_PLUGIN_DIR.'includes/' );
	define( 'VAP_ASSETS_DIR', VAP_PLUGIN_DIR.'assets/' );
	define( 'VAP_CSS_DIR', VAP_ASSETS_DIR.'css/' );
	define( 'VAP_JS_DIR', VAP_ASSETS_DIR.'js/' );
	define( 'VAP_IMAGES_DIR', VAP_ASSETS_DIR.'images/' );

	// URL define
	define( 'VAP_PLUGIN_URL', WP_PLUGIN_URL.VAP_PLUGIN);
	define( 'VAP_ASSETS_URL', VAP_PLUGIN_URL.'assets/');
	define( 'VAP_IMAGES_URL', VAP_ASSETS_URL.'images/');
	define( 'VAP_CSS_URL', VAP_ASSETS_URL.'css/');
	define( 'VAP_JS_URL', VAP_ASSETS_URL.'js/');
	
	global $vap_version;
	$vap_version = '1.0.1';

	class VinArticlePost {
		var $vap_setting = '';
    
		function __construct() {
			global $wpdb;

			$this->vap_sync = 'vap_sync';
			$this->vap_setting = 'vap_settings';
			
			register_activation_hook( __FILE__,  array( &$this, 'vap_install' ) );

			register_deactivation_hook( __FILE__, array( &$this, 'vap_deactivation' ) );

			add_action( 'admin_menu', array( $this, 'vap_add_menu' ) );

			add_action( 'admin_enqueue_scripts', array( $this, 'vap_enqueue_scripts' ) );
			
			add_filter( 'plugin_action_links_' . plugin_basename( __FILE__ ), array( $this, 'vap_action_links' ) );
		}
		
		static function vap_install() {
			global $wpdb, $vap, $vap_version;

			$charset_collate = $wpdb->get_charset_collate();
			
			require_once( ABSPATH . 'wp-admin/includes/upgrade.php' );

			update_option( "vap_plugin", true );
			update_option( "vap_version", $vap_version );

		}

		static function vap_deactivation() {
			
		}
		
		function vap_get_sub_menu() {
			$vap_admin_menu = array(
				array(
					'name' => __( 'Sync / Import' ),
					'cap'  => 'manage_options',
					'slug' => $this->vap_sync,
				),
				array(
					'name' => __( 'Settings' ),
					'cap'  => 'manage_options',
					'slug' => $this->vap_setting,
				),
			);
			
			return $vap_admin_menu;
		}

		function vap_add_menu() {
			$vap_main_page_name = __( 'Vin Articles' );
			$vap_main_page_capa = 'manage_options';
			$vap_main_page_slug = $this->vap_sync; 

			$vap_get_sub_menu   = $this->vap_get_sub_menu();
			add_menu_page($vap_main_page_name, $vap_main_page_name, $vap_main_page_capa, $vap_main_page_slug, array( &$this, 'vap_route' ), 'dashicons-update-alt', 11 );

			foreach ($vap_get_sub_menu as $vap_menu_key => $vap_menu_value) {
				add_submenu_page(
					$vap_main_page_slug, 
					$vap_menu_value['name'], 
					$vap_menu_value['name'], 
					$vap_menu_value['cap'], 
					$vap_menu_value['slug'], 
					array( $this, 'vap_route') 
				);	
			}
		}
		
		function vap_route() {
			global $vap_sync, $vap_settings;
			
			if( isset($_REQUEST['page']) && $_REQUEST['page'] != '' ){
				switch ( $_REQUEST['page'] ) {
					case $this->vap_setting:
						$vap_settings->vap_display_settings();
						break;
					default:
						$vap_sync->vap_display_settings();
						break;
				}
			}
		}
		
		function vap_admin_slugs() {
			$vap_pages_slug = array(
				$this->vap_sync,
				$this->vap_setting,
			);
			
			return $vap_pages_slug;
		}

		function vap_is_page() {
			if( isset( $_REQUEST['page'] ) && in_array( $_REQUEST['page'], $this->vap_admin_slugs() ) ) {
				return true;
			} else {
				return false;
			}
		} 
		
		function vap_enqueue_scripts() {
			global $vap_version;
			
			if( $this->vap_is_page() ) {
				wp_register_script( 'vap_admin_js', VAP_JS_URL . 'vap_admin_js.js', 'jQuery', $vap_version, true );
				wp_enqueue_script( 'jquery' );
				wp_enqueue_script( 'vap_admin_js' );
				wp_localize_script( 'vap_admin_js', 'vap_ajax_object', array( 'ajax_url' => admin_url( 'admin-ajax.php' ) ) );
			}
		}
		
		function vap_action_links( $links ) {
			$row_meta = array(
				'settings' => '<a href="'. menu_page_url( 'vap_settings', false ) .'">Settings</a>',
			);
         
			return array_merge( $links, $row_meta );
		}
	}

	global $vap;
	$vap = new VinArticlePost();

	include_once( VAP_INCLUDES_DIR . "vap_settings.class.php" );
	include_once( VAP_INCLUDES_DIR . "vap_sync.class.php" );
	
}