How to Hide Conditional Payments and Shipping for WooCommerce Meta Boxes

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

	//Hide the "Upgrade To Pro" meta box.
	remove_meta_box('rspw_pro_promotion_box_id', $screen->id, 'side');
	//Hide the "Condition Properties" meta box.
	remove_meta_box('shipping_conditions_metabox', $screen->id, 'normal');
	//Hide the "Condition Properties" meta box.
	remove_meta_box('payment_conditions_metabox', $screen->id, 'normal');
}

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

Where do I put this code?