Send password through email after checkout

pmpro-email-password.php

/*
 * Send members password through email after checkout. 
 * Use PMPro Email Templates shortcode !!password!! in checkout emails.
 * Remove password fields using custom checkout template to auto generate password.
*/
function my_generate_passwords()
{
	if(!empty($_REQUEST['username']) && empty($_REQUEST['password']))
	{
		$_REQUEST['password'] = pmpro_getDiscountCode() . pmpro_getDiscountCode();	//using two random discount codes
		$_REQUEST['password2'] = $_REQUEST['password'];
	}
}
add_action("init", "my_generate_passwords");

function my_email_password()
{
	global $gateway;
	
	$password = $_REQUEST['password'];
	$username = $_REQUEST['username'];
	
	$transient_var = $username."_password";
	
	set_transient( $transient_var, $password, HOUR_IN_SECONDS);
}

add_action('pmpro_after_checkout', 'my_email_password');

function my_pmpro_paypalexpress_session_vars()
{
	$username = $_SESSION['pmpro_signup_username'];
	$password = $_SESSION['pmpro_signup_password'];
	
	$transient_var = $username."_password";
	set_transient( $transient_var, $password, HOUR_IN_SECONDS);
}

add_action('pmpro_paypalexpress_session_vars', 'my_pmpro_paypalexpress_session_vars');

function my_pmpro_email_data($data, $email)
{
	$password = get_transient($data['user_login'].'_password');
	
	if($password != false)
		$data['password'] = $password;

	return $data;
}
add_filter("pmpro_email_data", "my_pmpro_email_data", 10, 2);