Add !!invoice_subtotal!! and !!invoice_tax!! to email templates Paid Memberships Pro.

add-invoice-details-to-email-pmpro.php

<?php
/**
 * This creates two variables !!invoice_subtotal!! and !!invoice_tax!! to email templates where the !!invoice_id!! is available.
 * Add this code to your site by following this guide - https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */
function my_pmpro_add_invoice_details_to_email( $data, $email ) {

	if ( isset( $data['invoice_id'] ) ) {
		$invoice = new MemberOrder($data['invoice_id']);
		$data['invoice_subtotal'] = isset( $invoice->subtotal ) ? pmpro_formatPrice( $invoice->subtotal ) : '';
		$data['invoice_tax'] = isset( $invoice->tax ) ? pmpro_formatPrice( $invoice->tax ) : '';
	}

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