Email Variable Add !!tax!! and !!subtotal!! variable for Paid Memberships Pro email templates

add-tax-pmpro-emails.php

<?php
/**
 * Adds an email variable !!tax!! to Paid Memberships Pro emails.
 * Only works for email templates that has the !!invoice_id!! variable available. 
 * Use the Email Templates Admin Editor to add !!tax!! to your email templates.
 * Follow this guide to add this code to your site: https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 *
 * Difficulty: Easy
 */
function my_pmpro_email_variable( $data, $email ) {
	
	if ( isset( $data['invoice_id'] ) && $data['billing_country'] == 'AU' ) {
		$order = new MemberOrder( $data['invoice_id'] );
		$total = $order->total;
		
		if( (int)$order->membership_id == 2 ) {
			$amount_before_tax = $total / 1.15; //Assuming 15% tax for level 2
		} else if( (int)$order->membership_id == 3 ) {
			$amount_before_tax = $total / 1.20; //Assuming 20% tax for level 3
		} else {
			//Assume no tax
			$amount_before_tax = $total;
		}
		
		$tax = $total - $amount_before_tax;
			
		$data['tax'] = pmpro_formatPrice( $tax );

	} else {
		$data['tax'] = pmpro_formatPrice( 0 );
	}

	return $data;
}
add_filter( 'pmpro_email_data', 'my_pmpro_email_variable', 10, 2 );