How to Hide WooCommerce TBC Credit Card Payment Gateway (Free) Dashboard Widgets

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

	//Remove the "Plug and Pay - Products" widget.
	remove_meta_box('plugandpay_products_widget', 'dashboard', 'side');
	//Remove the "Plug and Pay - Blog" widget.
	remove_meta_box('plugandpay_blog_widget', 'dashboard', 'side');
}

add_action('wp_dashboard_setup', 'plt_hide_woo_tbc_payment_gateway_dashboard_widgets', 20);

Where do I put this code?