Tips on Customizing Perfecty Push Notifications

How to Hide Perfecty Push Notifications Admin Menus

function plt_hide_perfecty_push_notifications_menus() {
	//Hide "Perfecty Push".
	remove_menu_page('perfecty-push');
	//Hide "Perfecty Push → Dashboard".
	remove_submenu_page('perfecty-push', 'perfecty-push');
	//Hide "Perfecty Push → Send notification".
	remove_submenu_page('perfecty-push', 'perfecty-push-send-notification');
	//Hide "Perfecty Push → Notification jobs".
	remove_submenu_page('perfecty-push', 'perfecty-push-notifications');
	//Hide "Perfecty Push → Users".
	remove_submenu_page('perfecty-push', 'perfecty-push-users');
	//Hide "Perfecty Push → Settings".
	remove_submenu_page('perfecty-push', 'perfecty-push-options');
	//Hide "Perfecty Push → Logs".
	remove_submenu_page('perfecty-push', 'perfecty-push-logs');
	//Hide "Perfecty Push → About".
	remove_submenu_page('perfecty-push', 'perfecty-push-about');
}

add_action('admin_menu', 'plt_hide_perfecty_push_notifications_menus', 11);

Where do I put this code?

How to Hide the "Perfecty Push" Meta Box

function plt_hide_perfecty_push_notifications_metaboxes() {
	$screen = get_current_screen();
	if ( !$screen ) {
		return;
	}

	//Hide the "Perfecty Push" meta box.
	remove_meta_box('perfecty_push_post_metabox', $screen->id, 'side');
}

add_action('add_meta_boxes', 'plt_hide_perfecty_push_notifications_metaboxes', 20);