What is the use of social security card certification?

Social security card vouchers were used to pay social security in that month. Since the social security card has been opened in the province before, I only have the social security card voucher when paying social security in other cities (different cities in the province) after changing jobs, and I began to pay social security in the same month.

Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.