Android application shppoing

The project include android, design, server this app will be a small shopping app for a grocery store and whatever is added to the database should appear in the app, be under categories. Tasks: 1- build database and web API 2- Add Facebook login to the login interface 3- When the user logs in I want it to enter to a swipes interfaces 4- First swipe is the user profile 5- Second swipe are the categories of the items I’ll have in the database 6- Second swipe I want a search bar - *to search for available items* Note: user can see all items detail list on app and all item details will be download from database An admin page is needed to add product but in what manner I’m not sure. 7- Third swipe to-do list 8- Fourth swipe Bar code scanner to add to cart 9- Fifth swipe the cart and checkout - Note: My payment type will be only cash on delivery. Other features: - 1- Before checkout I want the user to be asked whether to use current location or location already in profile 2- Push notifications appear to users about promotions or other things. (I haven’t done this yet) Q. When can user receive push notification from server? A. In all shopping apps there is always push notifications that appears to the user whenever they already have items in the cart that they haven't purchased yet or whenever a there is a discount is or promotion happening on the items