E-commerce Software.Customisation of PDshop e-commerce software

We have PDshop e-commerce software with source in .net and SQL [login to view URL] want to do following changes in the software 1) Seller Management System a) Seller details application form with uploading facility of image, documents like Pan card, Aadhar card, Bank account proof . b) After the seller account approved by admin, ID and password get generated through system and notified to the seller through email and sms. c) Items detail uploading(Bulk and single items) facility in Seller login and approval of the same(items) by admin before displaying those items on portal. d) Uploading facility of courier charge for each items in seller login. Also uploading facility of courier charge in Admin login while uploading data. e) Seller can generate Bill with all taxes from his admin panel on the name of consumer/buyer f) Seller receives all payments in offline way in his registered bank account. g) Same items can be available with different prices from different sellers. Therefore along with the product details and price, different available seller names should also made available on the portal. h) Ticket Support Module between Sellers and Admin. 2. Product Search with Multiple Filter options like brand wise, price between, company name etc. 3. Latest News and Updates displaying facility in main page. 4. SMS API Integration (we will provide you API) 5. Live Chat Facility 6. SMS and Email alerts on following events a) Member Registration b) Successful Purchase c) For notifying order processing, dispatched, on the way, delivered etc. d) On Gift Vouchers Sending e) For notifying Discounts, Mega Sale offer etc to registered customer of our site. 7. Track Your Order facility in customer login. 9. Return notification facility to seller and Admin in customer login. Company will accept returns within 10 days(days may vary and fixed by Admin) from date of delivery of the item and returns will be accepted only in the case of damaged, defective or wrong product received. 10. On Line Cancellations of order in customer Login. 11. Customer can see his recently viewed items in his login. 12. Recommendation based on customer browsing History and purchasing history of other customer like customer who purchased this items(say A) have also purchased following items. 13. My Wallet (The wallet is used to hold refund balance, Gift Cards or promotional credit associated with my domain account.) 14. Download Mobile App.(iphone,Android,Windows) 15. FAQ'S page. 16. Display of Selling Price,Courier charge and Grand Total while buying of Items 17. Facility to exempt currier charge depending on total cost of the product(Admin and Seller will decide). 18. Consumer can buy product through Payment Gateway(PG) or Case on delivery (COD). COD system will work with pin code search and logistic support will approve the delivery of the product. It will upgrade time to time.