Add Canadian Tax to PMPro checkout

pmpro-canada-tax-checkout.php

<?php
/**
 * Add 13% tax to all Canadian customers checking out for a membership level.
 * To add this code to your site, please follow this guide - https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */
function customtax_pmpro_tax_ca($tax, $values, $order) {
	if ( $_SESSION['bcountry'] == 'CA' || $_REQUEST['bcountry'] == 'CA' ) {
			$tax = round( (float) $values[price] * 0.13, 2 );		
	}
	return $tax;
}
add_filter( 'pmpro_tax', 'customtax_pmpro_tax_ca', 10, 3 );