Fix PayPal rounding error

functions.php

/**
 * Round Shipping in the event of PayPal errors
 */
add_filter( 'woocommerce_package_rates', 'fix_shipping_rounding_errors' , 10, 2 );

/**
 *
 */
function fix_shipping_rounding_errors( $rates, $package ) {
 
	foreach ( $rates as $rate ) {
		$rate->cost = round( $rate->cost, absint( get_option( 'woocommerce_price_num_decimals' ) ) );
	}

	return $rates;
}