Foreign customers need to provide local tax payment certificate or social security certificate for more than one year when buying a house locally, otherwise they need to make a down payment of 50% for the first time, which is regarded as a second mortgage, and the interest rate rises 10%. If you buy a house with a local loan, you don't need to provide proof of social security.
Mortgage to buy a house needs to provide the following materials: down payment invoice, house purchase contract, ID card, marriage certificate, work certificate, income certificate and bank account.
Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.