You pay for delivery directly to the courier by any 4 methods:
1) Bitcoin
I'm only seeing three methods on your "Customer FAQ" page and Bitcoin isn't one of them... I hope it's just a mistake and not a workaround for not acquiring the bitlicense!
Bitcoin in our service is used only by couriers to insure their delivery orders.
Based on the above quote, this isn't the only way Bitcoin is used in your services!