How can second-hand items sent by users on the company’s website be synchronized to other second-hand trading websites such as 58 and fair?

  question

How can second-hand items sent by users on the company’s website be sent to 58, the fair, or other second-hand trading websites simultaneously?
Do you have any ideas to solve similar problems?
@ Sunny Gao yang

For example, curl is triggered to simulate logging on other major websites and posting. The premise is to keep logging in, otherwise the verification code will not be easy. Oh, by the way, there seems to be a premise that other major websites may have mechanisms to refuse such simulation requests.