BCC an additional email on the Member Invoice emails

my_pmpro_email_headers_bcc_on_invoice_email.php

<?php
/*
 * BCC an additional email on the Member Invoice emails
 */
function my_pmpro_email_headers_bcc_on_invoice_email( $headers, $email ) {		
	if ( strpos( $email->template, 'invoice' ) !== false ) {
		//add bcc
		$headers[] = "Bcc:" . "otheremail@domain.com";		
	}
 
	return $headers;
}
add_filter( 'pmpro_email_headers', 'my_pmpro_email_headers_bcc_on_invoice_email', 10, 2 );