WPMU Membership 2: Add user email in the M2 communication email

code.php

<?php

add_filter( 'ms_model_communication_comm_vars', function( $comm_vars, $type, $member, $subscription ) {
	$comm_vars['%user-email%'] = 'User: User Email';
	return $comm_vars;
}, 99, 4 );

add_filter( 'ms_model_communication_send_message_comm_var-%user-email%', function( $var_value, $type, $member, $subscription, $invoice ) {
	return $member->email;
}, 99, 5 );