The face as a blue card: payments by facial recognition are booming in China. In Shanghai's supermarkets or the Shenzen subway, for example, they save time for users. As Beijing embarks on the path of "cashless", they are also an ever more effective means of control for the authorities. Reportage.

Facial recognition and biometric technologies that can also help to find an identity. More than one billion people in the world do not have a legal existence. Without identification, no access to financial, health or education systems. But the guarantee for all of a legal identity is one of the UN's objectives for 2030. So how to build reliable digital identification systems? Answers with our guest Antoine Grenier, senior VP of Idemia. This biometrics leader has just deployed the OSIA interface alongside NGOs and the World Bank in the Democratic Republic of Congo. Objective: to identify 2.4 million children and produce 600,000 birth certificates.