Hi, my name is Vincent and my company is planing to develop an app to one of our customers that want to use Bitrix's intranet. The function of the app is add to their Bitrix contacts the emails provided by their web site (they are stored in the customer database of course). In other words: we can get their contacts but we need save them in their Bitrix intranet with a custom app. I've already read the "Rest API" (http://www.bitrixsoft.com/rest_help/) but I can't fully understand how I can implement it in a Html-Js-Php code, there is a tutorial or video can teach me better on how to use the API? The API can't be downloaded, their methods only can be called? Thank you for your help in advance.