installing vamcart in existing cake php

Hello 

I was working on a site of Cake php which was successfully delivered.But recently Client again  asked me to put the online shop module  in it.I installed vamcart eCommerce plugin in webroot folder of main site .Now issue arising with session and log in ,admin had to log in again in vamcart admin section whenever he wants to do something in (add,delete,Viewing orders) vamcart and session created in main site get expired.I want that user will be redirected to the vamcart  with the session still there(created during log in in main site). Please help me in the right direction,that how to share the authentication , and the second one how to customize the .htaccess file so that URL's look good.

Thanks and regards

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