To get permission to leave China¡¯s coronavirus epicenter and return to his job in Hong Kong, a Chinese banker needed two things: a letter from his company and a green health code from an Alibaba app.

The man, who gave his name only as Clarence because of privacy concerns, secured the necessary permission last week and boarded a high-speed train to the border city of Shenzhen.

¡°It was like the drama ¡®Prison Break.¡¯ There are so many levels to go through and so many barriers to overcome,¡± he said of the challenges of leaving Hubei province.