The work certificate can be the original work certificate issued by the employer (please indicate the specific company name, department, position and income, and affix the official seal or personnel seal of the company), or a copy of the work permit/license; Proof of financial resources can be payroll records issued by banks, or income tax withholding vouchers, or documents proving the market value of houses, automobiles, deposits, investments, etc. (such as photocopies of real estate license/automobile driving license/bank time deposit certificate) and other materials that can prove financial resources.
The list of social insurance personal accounts in the past six months can be used as a very good supplementary proof, which is often more valuable than income proof, but it is not necessary. If you can ask the fixed work unit to provide proof of work and income, it will be enough.