Synic Systems have very good knowledge on Facebook API integration (Extension/Add-on) with CS-Cart Shopping eCommerce platform (CS Cart Facebook Connect Login Addon) and also we have development many eCommerce websites with third party API integration for our Clients. Facebook login add-on for CS-Cart allows customers to login into the store easily, using their Facebook account login details. Registering on websites is hard. So is trying to remember yet another username and password combination. Social login makes it easy for people to register on your site and quickly sign in using the social network or email identities they already have