Send admin checkout emails when using the PMPro Multiple Memberships per User Add On.

default_option_email_admin_checkout.php

<?php

// Copy from below here...

/**
 * Send admin checkout emails when using the PMPro Multiple Memberships per User Add On.
 * 
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */
 add_filter( 'default_option_pmpro_email_admin_checkout', '__return_true' );
 add_filter( 'option_pmpro_email_admin_checkout', '__return_true' );