Change text for PMPro Shipping

my-gettext-shipping.php

<?php
/**
 * This recipe changes text for the PMPro Shipping Add On.
 *
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */

function my_gettext_shipping( $translated_text, $text, $domain ) {
	if ( 'pmpro-shipping' === $domain || 'paid-memberships-pro' === $domain || 'pmpro' === $domain ) {
		switch ($text) {
			case 'Shipping Address':
				$translated_text = 'Mailing Address';
				break;
			case 'Ship to the billing address used above.':
				$translated_text = 'Use Address above';
				break;
			case 'State':
				$translated_text = 'County';
				break;
			case 'Zip':
				$translated_text = 'Postcode';
				break;
			case 'City, State Zip':
				$translated_text = 'City, County, Postcode';
				break;
		}
	}

	return $translated_text;
}
add_filter( 'gettext', 'my_gettext_shipping', 10, 3 );