How to Hide Conditional Payment Methods for WooCommerce Meta Boxes

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

	//Hide the "Payment gateways" meta box.
	remove_meta_box('vg_payment_gateways_mbx', $screen->id, 'advanced');
	//Hide the "Conditions" meta box.
	remove_meta_box('vg_payment_gateways_conditions_mbx', $screen->id, 'advanced');
}

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

Where do I put this code?