PayPal’s global head of developer evangelism Jonathan LeBlanc says Passwords will be replaced with the identification of your body. He has recently started giving a presentation titled “Kill all Passwords” at various security and tech conferences in the U.S. and Europe. Instead of using “antiquated” external body scans such as Fingerprints and IRIS scanners, internal body functions such as Vein and Heartbeat recognition are used. Ingestible devices, he mean devices that could be powered by your stomach acid, which will run the batteries of those devices.
Source: https://thehackernews.com/2015/04/paypal-password-human.html