Website A to B ,One-click publishing feature？

1 First of all, our company has its own website (here referred to as website A), which can post positions.Then there is another site (called site B) where you can post jobs.The requirement is, in our own website A, do A one-click post to website B function, that is, the user posts in website A, what technology we use to automatically publish these content to website B.How does this work? 2 Do you have to bypass each other's validation mechanisms? 3 What HTTP request libraries are needed?