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

my_pmpro_email_checkout_renewal.php

<?php   // do not copy this line.
/**
 * This recipe will let you create a unique email for renewals.
 * 
 * You must add this recipe to your site by creating a custom plugin
 * Read this companion article for step-by-step directions 
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */

/*
	Use a custom checkout_renewal.html email template for renewals.

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

	Add a file /email/checkout_renewal.html in that email folder.
	/plugins/pmpro-customizations/email/checkout_renewal.html
*/

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 = $order->is_renewal();
	if(!$is_renewal)
		return $email;

	//this is a renewal! let's do our stuff
	//update subject
	$email->subject = "Thank you for your renewal.";
		
	//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', 20);

Sample checkout_renewal.html page here: https://gist.github.com/kimwhite/73189be1bf59c0dec736b07b84bf4f02

This snippet is include on tool tip https://www.paidmembershipspro.com/customize-membership-checkout-confirmation-email-membership-renewals/