How to communicate with external server

I am working on a game where we want to fetch content (Dynamic content through API) from our server to FB instant game and also wanted to submitted users action to our server.

One of the options i have checked is "AJAX" call. but this mightn't be the secure way. Is there any specific protocol or processes are defined to get dynamic content from third party server in FB instant Game.

Asked about 2 months ago