Hello,
do You have experience using CoinPayments.net payment gateway?
I have been using their WHMCS module since 2014 and im happy with it.
They accept many cryptocurrencies and also PayPal. It really works
One can set auto withdrawal of payments to his external crypto wallets. Im using BleuTrade.com for receiving various crypto payments from this system, because BleuTrade then allow me to convert all alt coins into BTC and then send BTC to an exchanger (Bitstamp or Alfacashier) where i get USD/EUR cash.