PayPal's iPhone and iPad application was updated on the App Store this morning with support for iOS 10's SiriKit integration for mobile payments, allowing you to send and request money in 30 countries around the world using just your voice.
With a simple voice command like “Send $20 to Dad using PayPal” or “Request $20 from John with PayPal”, Siri connects with the PayPal service and pulls up a custom sheet with details of your transaction before you authorize it.