The whole payment processing is not done by Shuffle iT but their payment provider www.mollie.com
. It's highly unlikely Shuffle iT would use a side channel, considering that dealing with payments has legal implications (taxes, etc.) Is paypal really the only option presented for your country?
I remember being able to pay with Bitcoin at least once, but then after the exchange rates became more volatile than before, most payment providers have dropped Bitcoin payments (Steam and Microsoft took them, for example, but I think no longer do).