add_action( 'wp_ajax_vap_setting_dellastsync', array( $this, 'vap_setting_dellastsync' ) ); call function wp admin plugin through ajax jquery https://prnt.sc/zskgPlNPVRu_

vap_settings.class.php

<?php

if( !class_exists ( 'VAP_Settings' ) ) {

    class VAP_Settings {
    	function __construct(){

    		add_action( "vap_save_settings", array( $this, "vap_save_settings_func" ), 10 , 1 );

			add_action( 'wp_ajax_vap_setting_dellastsync', array( $this, 'vap_setting_dellastsync' ) );
    	}

    	function vap_display_settings( ) {
    		if( file_exists( VAP_INCLUDES_DIR . "vap_settings.view.php" ) ) {
    			include_once( VAP_INCLUDES_DIR . "vap_settings.view.php" );
    		}
    	}

        function vap_default_setting_option() {
            return array(
                'vap_api_url' 		=> '',
                'vap_api_key' 		=> '',
				'vap_project_id' 	=> '',
				'vap_append_post' 	=> 1,
				'vap_auto_publish' 	=> '',
            );
        }

    	function vap_save_settings_func( $params = array() ) {
    		if( isset( $params['vap_setting'] ) && $params['vap_setting'] != '') {
                unset( $params['vap_setting'] );
    			unset( $params['vap_setting_save'] );

                update_option('vap_setting', $params);

    			$_SESSION['vap_cfg_msg_status'] = true;
    			$_SESSION['vap_cfg_msg'] = 'Settings updated successfully.';
    		}
    	}

        function vap_get_settings_func( ) {
            $ncm_default_general_option = $this->vap_default_setting_option();
            $ncm_setting_option = get_option( 'vap_setting' );

            return shortcode_atts( $ncm_default_general_option, $ncm_setting_option );
        }

		function vap_setting_dellastsync() {

			update_option('vap_lastsync', array(
				'timestamp' => 0,
				'category' 	=> 0,
				'page' 		=> 1,
			));

//			echo get_option('vap_lastsync');
			echo json_encode( array( 'success' => true , 'data' => get_option('rentalist_setting')) );


			wp_die();
		}
    }

    global $vap_settings;
    $vap_settings = new VAP_Settings();
}

?>

https://prnt.sc/zskgPlNPVRu_ call from postman insertinng cookie in header and body form-data ; action -> function to call in wp admin