Paying social security for foreign city hukou in Shanghai is three risks.

Shanghai social security payment is related to household registration, and has nothing to do with what residence permit to apply for.

If you are registered in a foreign town, you can pay five social insurances: pension, medical care, unemployment, work injury and maternity.

Non-urban household registration in other places can pay social security three insurances, including old-age insurance, medical insurance and work-related injury insurance, and can also be paid by the employing unit in consultation with its employees in accordance with the provisions of social insurance for urban employees in this city, that is, three insurances are converted into five insurances.

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