How to Hide QUID Payments Admin Menus and Meta Boxes - PluginTests.com

How to Hide the "QUID Payments" Admin Menu

function plt_hide_quid_payments_menus() {
	//Hide the "Settings → QUID Payments" menu.
	remove_submenu_page('options-general.php', 'quid_settings');
}

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

Where do I put this code?

How to Hide the "QUID - Post Settings" Meta Box

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

	//Hide the "QUID - Post Settings" meta box.
	remove_meta_box('wporg_box_id', $screen->id, 'advanced');
}

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