Add Password to checkout email for Paid Memberships Pro.

add_password_to_pmpro_checkout_email.php

<?php
/**
 * Add the user's password to the checkout emails.
 *
 * Please be sure to take proper precautions when dealing with user's passwords and sending out emails.
 * This is for demonstrative purposes.
 * Add this code to your PMPro Customizations Plugin - https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 **/
function add_password_to_pmpro_checkout_email( $body, $email ) {

	if ( strpos( $email->template, 'checkout' ) === 0 && strpos( $email->template, 'admin' ) === false ) { // Add's password field to templates that start with checkout and don't contain admin.

		$password = $_REQUEST['password'];

		if ( ! empty( $password ) ) {
			$body .= '<p>Your password is: ' . $password . '</p>';
		}
	};

	return $body;
}

add_filter( 'pmpro_email_body', 'add_password_to_pmpro_checkout_email', 10, 2 );