Change login url in WordPress emails.

pmro-customization-login-url-example.php

<?php
/*
Plugin Name: PMPro Customizations
Plugin URI: https://www.paidmembershipspro.com/wp/pmpro-customizations/
Description: Customizations for my Paid Memberships Pro Setup
Version: .1
Author: Paid Memberships Pro
Author URI: https://www.paidmembershipspro.com
*/
//Now start placing your customization code below this line

// Change login url in WordPress  emails

function change_email_login_link($data, $email)
{
	$data['login_link'] = '<a href = "https://example.com/my-custom-login-page/">https://example.com/my-custom-login-page/</a>';
	return $data;
}

add_filter('pmpro_email_data', 'change_email_login_link', 10, 2);