The blue card of Macao is issued by the residence and stay office of Macao Public Security Police, which includes information such as name, gender, position, employment company, labor service company, contract validity period, blue card number, etc. The main function of the blue card is to prove the identity of the workers.
Simply put, it is the identity certificate that the Macao government allows you to work in Macao. Macao companies must have blue card places to recruit mainlanders to work.