The last six digits of the mobile phone number. It will give points when Chow Tai Fook buys things, and these points will automatically generate a payment password, which is the last six digits of the original mobile phone number. Chow Tai Fook is the largest jewelry company listed in Hong Kong, specializing in Chow Tai Fook brand jewelry, jade and gold ornaments. It is a comprehensive enterprise integrating raw material procurement, production design and retail services.