I need clarity on how to connect unreal using rest api to Amazon Web Service.
If not amazon web service, then any other cloud service.
Probably this a good example: GitHub - ufna/VaRest: REST API plugin for Unreal Engine 4 - we love restfull backend and JSON communications!
Communication is done via json. It has an implemetation to connect to the parse api, and is easily extensible to use any other api.