Where does Yueqing China Resources Maintenance need app signature?

Yueqing China Resources Maintenance needs app to log in to China Resources Gas APP. According to the relevant public information, the gas company sends professionals to check whether the gas meter and gas pipeline are hard or soft to see if there are hidden dangers and whether there is air leakage. After the inspection, there will be two documents to be signed by the head of household. These operations are all carried out on China Resources Gas app, and the signature is also to be electronically signed on the mobile app.