Sending Receipt # upon purchase to emails

Hi there, currently i am using amember pro, i am manually adding users and editing their subscription/payment status.

I am also manually creating receipt number.

How do i show the receipt number and the period in the confirmation email the system send out to the purchaser??

This quote only shows: 1) the product title and 2) the product price.

{foreach from=$products item=p}
{$p.title|string_format:"%-50s"} {$config.currency|default:"$"}{$p.price}
{/foreach}

What is the code i must add to include my receipt number and period ?

ps: i know tat payment system cant be put inside, just wish to put in all others except payment system.

Thanks anyone