Online Store for Mobiles - Single Seller e-Com Portal with Complete Mentainance

We are a Delhi, India based Mobile Refurbishing Company presently selling on all major portals like : Amazon, Snapdeal, Flipkart, ebay etc. We are looking to build our own website . Some major features apart from the usual ones are : - 1. Payment Integration with GAteway 2. Automatic Order confirmation using SMS OTP 3. Integration with Logistics partner API ( Provided by us) 4. No limit on catalouge & Categories . 5. Cataloging to be done by Development Company (Data to be provided by us ) & tool to be built for fetching of data using URL from other portals like :- Amazon, GSMAreana , Flipkart etc 6. Complete mentainance of website in all forms & providing interfaces for all kinds of reports required by us . DEsigning of Weekly /Daily Banners, Promotional E-mailers, Content & Desgining included in this. 7. Building & Managing Social media pages & handles 8. Promotion of all sorts except Google adwords or Facebook ads to be included in the package 9. Website should be build on such a platform under which even complete theme / layout changes are possible. 10. Developing Mobile app for the same as well ONLY OFFERS FROM INDIA ARE ACCEPTABLE & preferably DELHI & NCR Regards