An Alibaba employee demonstrates 'Smile to Pay', an automatic payment system that authorize payment via facial recognition

Redefining the term "happy meal", fast food fanatics in China now just need to flash their smiles to earn their dinner. Alibaba's Ant Financial has teamed up with KFC in the eastern Chinese city of Hangzhou to debut its news "smile to pay" service.

Pedestrians walk past a Yum! Brands' KFC restaurant in Shanghai. Tomohiro Ohsumi | Bloomberg | Getty Images

The service allows customers to process their payment simply by smiling after placing their order at one of the fast food restaurant's self-serve screens. A 3-D camera then scans the customer's face to verify their identity. An additional phone number verification option is available for added security.

An Alibaba employee demonstrates 'Smile to Pay', an automatic payment system that authorize payment via facial recognition Alex Wong | Staff | Getty Images