Filter the settings of email frequency and custom email template when using the Extra Expiration Warning Emails Add On

custom_pmproeewe_email_frequency_and_templates.php

<?php
/**
* Filter the settings of email frequency and template sent when using the Extra Expiration Warning Emails Add On
* https://www.paidmembershipspro.com/add-ons/extra-expiration-warning-emails-add-on/
*
* Update the $settings array to your list of number of days => 'template_name'. The example below uses a custom
* email template added to your active theme in a new 'paid-memberships-pro/emails' custom folder. 
* The email file name is listed without its .html extension.
*/

function custom_pmproeewe_email_frequency_and_templates( $settings = array() ) {
	$settings = array(
		60 => 'membership_expiring_1',
		30 => 'membership_expiring_2',
		10 => 'membership_expiring_3',
	);
	return $settings;
}
add_filter( 'pmproeewe_email_frequency_and_templates', 'custom_pmproeewe_email_frequency_and_templates', 10, 1 );

A version of this code that also sets up the email templates so you can edit them from the Memberships -> Settings -> Email Templates page in the admin dashboard can be found here: https://gist.github.com/ideadude/3ab0197ba67084b671a4eec5983f9f01