Looking for javascript expert.

Hi Freelancer! My project is to create a plug-in javascript, for the well-known manufacturer of app Goodbarber ([login to view URL]). The plugin must give access via facebook recording a promotional stamps collection service, registration is divided into free for end customers (should already be feasible through goodbarber) and pay for the shopkeepers (to be implemented in the plugin to be created). The plugin must allow a collection of stamps, have a settings page for the dealer where it can set its parameters for the collection and a main page to list of shopkeepers and practically every retailer a page for its dedicated collection. For further information you can write and give more details. Thank you!