Received a letter of introduction from Beijing social security card

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After paying the medical insurance for three months, I usually go to the Bank of Beijing designated by the Social Security Center to get the medical insurance passbook from the 20th or 25th to the end of each month. Every bank has different rules. Happiness Village is the Bank of Beijing designated by Chaoyang Social Security, and Dongdaqiao Sub-branch is required to bring my ID card. The letter of introduction stamped by the company says a company (social security registration certificate number and organization code), and an employee (ID number) goes to a branch of Bank of Beijing to get a medical insurance passbook.