Legal analysis: The contract requires the signature of the legal representative. However, if other persons in charge or directly responsible persons of the company are authorized by the company, they can also sign in the name of the company and affix the company seal, and their signatures will be valid. If the parties conclude a contract in the form of a contract, the contract is established when both parties sign or seal it.

Legal basis: Article 491 of the "People's Republic of China and Civil Code" If the parties conclude a contract in the form of letters, data messages, etc. and require the signing of a confirmation letter, the contract is established when the confirmation letter is signed.

If the goods or service information released by one party through the Internet or other information networks meets the conditions of the offer, the contract will be established when the other party selects the goods or services and successfully submits the order, unless otherwise agreed by the parties.