I am migrating from SAP BOBJ from SDK(3.1) to RESTful.(Visual Studio 2015 - Framework 4.5)

What are steps I need to follow. ?

How can I achieve with minimal changes?

Ho to replace "BusinessObjects.DSWS", "CrystalDecisions.Enterprise" dlls which doesnot support BOBJ 4.X ?

I am using RESTful api URL's and XML response right now .. It there any effiecient and quik way to migrate whole code.