Yes The staff of Ping An Pratt & Whitney said that all expenses have been marked in the contract and the electronic signature is authorized. Lawyers said that if an annex is stated in a contract, the annex has the same effect as the main contract, and even if it is unsigned or so-called "repeated signature", the contract is still valid. However, if the lender signs the contract without the consent of the parties, the effectiveness of the signature is obviously flawed.