In Restful or any application versioning i See that versioning is done by adding version to URL of the endpoint
It depends. It may be handled twofold:
In this scenario proxy server recognizes the URL and using the version part of the domain decides where to forward the request. Basically, as far as I know, if the version is located in the path (e.g.
http://app/api/v3/customers/1234) this scenario is rarely used. It's used more often if version is located in the domain (e .g.
Application exposes all the endpoints and handles the version resolution internally.
No matter how it's handled you still need to synchronize the resources internally - in DB e.g.