Use a custom checkout_renewal.html email template for renewal purchases in Paid Memberships Pro

my_pmpro_email_checkout_renewal.php

/*
	Use a custom checkout_renewal.html email template for renewals.
	
	Add this code to a custom plugin.

	Make sure there is a folder /email/ in the plugin folder.

	Add a file /email/checkout_renewal.html in that email folder.
*/
function my_pmpro_email_checkout_renewal($email) {
	$replace_data_again = false;

	//only filter emails with invoices
	if(empty($email->data['invoice_id']))
		return $email;

	//get order
	$order = new MemberOrder($email->data['invoice_id']);

	//make sure we have a real order
	if(empty($order) || empty($order->id))
		return $email;

	//check if there has been another order for the same user/level in the past
	global $wpdb;
	$is_renewal = $wpdb->get_var("SELECT id FROM $wpdb->pmpro_membership_orders WHERE user_id = '" . $order->user_id . "' AND membership_id = '" . $order->membership_id . "' AND id <> '" . $order->id . "' AND status NOT IN('refunded', 'review', 'token', 'error') AND gateway_environment = '" . $order->gateway_environment . "' LIMIT 1");

	if(!$is_renewal)
		return $email;

	//this is a renewal! let's do our stuff
	//update subject
	$email->subject = "Thank you for your application.";
		
	//update body
	$email->body = file_get_contents(dirname(__FILE__) . "/email/checkout_renewal.html");
		
	//replace data
	if(is_string($email->data))
		$email->data = array("body"=>$email->data);			
	if(is_array($email->data)) {
		foreach($email->data as $key => $value) {
			$email->body = str_replace("!!" . $key . "!!", $value, $email->body);
		}	
	}

	return $email;
}
add_filter('pmpro_email_filter', 'my_pmpro_email_checkout_renewal');