title: Restrict Magento customer to Stores
body: <p>I am using a Magento website with over 10 stores. These stores are managed by different companies. However, if a customer created an account in Store(View) 1, he can also log in on StoreView 2. Is their a way to restrict this and make sure he can only login to the Store he was created in?</p>
  
  <p>I know it is possible to restrict account sharing on a website level, but I need Store level.</p>
  
  <p>Thanks!</p>