Anaplan API


Here i'm trying to use Anaplan API to build the integration between the Anaplan and SQL Server database. I could have used ETL tools, but I don't have any ETL tools to do this.

Can someone provide me information on how Anaplan API works with some examples? 

I was reading documentation provided by Anaplan using RESTful APIs but i'm new to this concept and not sure how it works. I'm reading and learning here. If you could provide me sample demo on my requirement, that would be very helpful.