Build a basic sales app for android -- 2

Build and design a basic sales app for android. - Catalog with possability to add products to cart. - Check each item individully - Search function / sort function / categories. - Admin login - Checkout/cart page where you can retreive company information from government register, or manually enter them. Option to choose different delivery address than the invoice/company address. Set payment terms in days, standard is fixed from backend. Can be changed by entering an admin passowrd. See delivery time for each item. Add new freight cost automatically when different delivery time. Company VAT ID Phone Email Contact person: Invoice address (street, number, zip, city, country) If shippin address is same as invoice address. Discount this value is set in backend, if change in checkout, we need to enter admin pass. Freight cost: Set at standard, but can be changed if amount of certain, or changed by admin pass. SIGNATURE: add feature so that the person placing the order will sign using hand/finger. Order confirmation can be sent to email, or printed or saved in PDF. Backend: - Add/edit/remove products - Set delivery time for specific items. - Set minimums/prices for certain products - Set minimum order values - See order history - Set standard freight cost. - Set standard Discount. - Change order/delete order. For change order, require signature from customer for revisions. If I have missed something, please make sure to add it.