How to inquire about the online filing of Yancheng commercial housing contract? . . I need to provide this thing to run a provident fund withdrawal bank in Nanjing. I couldn't find it after searching

How to inquire about the online filing of Yancheng commercial housing contract? . . I need to provide this thing to run a provident fund withdrawal bank in Nanjing. I couldn't find it after searching for a long time. I can't stand it! Two points. First of all, if you want to inquire about the sales of real estate companies, you can inquire about the saleable houses on Yancheng Real Estate Information Online. If you want to provide proof of real estate information under your name to Nanjing Provident Fund Center, you can only issue a real estate inquiry certificate or a commercial housing sales contract at the real estate trading center where the house is purchased. Because you can't see the information of individual buying a house online. Can only see if this house is sold or not ~ professional real estate for 30 years