Muda o preço do PAC

code.php

add_filter( 'woocommerce_package_rates', 'lpb_change_correios_pac_cost', 10, 2 );
function lpb_change_correios_pac_cost ( $rates, $package ) {
	foreach ( $rates as $rate) {
		if ( $rate->method_id === 'correios-pac' ) {
			$rate->cost = 20;
		}
	}
	return $rates;
}