For better or worse, parting with your money just got a heck of a lot easier on iOS devices. All you have to do is bark a command to Siri to the effect of, “Hey Siri, send my brother Todd $50 using PayPal” and she will happily coordinate the transfer, simple as that. Siri will ask for confirmation, of course, just like when sending a text

Source: Hot Hardware – Siri Integration Comes To PayPal iOS App