I see on some sites when you click request a for address it creates a BTC, ETH, LTE address so you can send funds to, then it forwards it to a different address and post the transaction confirmation back to your site so you can update your DB and give the customer what they purchased.
Does anyone know what service does this so I can do it for my site?
Bitpay.com, but only for BTC and (soon?) BCH.