Develop the interface module for eBay and Amazon

A system for order management* and product management (included inventory). Use API to visit eBay and Amazon and implement all the functions below. eBay and Amazon share the inventory. *If need, FBA order management can be separated with other orders. 1. Listing and Product Management: eBay - Be able to list SKU from our system to eBay store based on eBay listing requirement (all fields which API allowed) - Be able to set up eBay search criteria for each SKU - Be able to deactivate the listing when need (synchronize to eBay) - Be able to synchronize the stocks Amazon - Be able to list SKU from our system to Amazon store based on Amazon listing requirement (all fields which API allowed) - Be able to set up Amazon search criteria for each SKU (Keywords filed on Amazon) - Be able to deactivate the listing when need (synchronize to Amazon) - Be able to synchronize the stocks - Be able to listing all other Competitive Listing based on keywords or ASIN - Be able to listing all other Competitive Price and lowest Price based on ASIN - Amazon Recommendations API 2. Download orders and Upload status: eBay: - Be able to download all the Sold & Paid orders, all the details (can manually download and automatic download) - Be able to change order status i.e. Processing, Awaiting Postage, Dispatched - Be able to sent out {AUTO} emails to customers at each stage of status change (can set ON/OFF) - Be able to read all PayPal payment records and can be matched with eBay orders (so cross-check both amounts) Amazon: - Be able to download all the Sold as well as Paid orders, all the details (can manually download and automatic download) - Be able to change order status i.e. Processing, Awaiting Postage, Dispatched - Be able to sent out {AUTO} emails to customers at each stage of status change (can set ON/OFF) 3. Messaging Interface: eBay: - Be able to integrate into eBay's messaging system, so customer emails sent through eBay can be stored, organized and replied to. This must use eBay API and not reply on any email software. - Easily find related message on each order. And on each message can easily find out the order. So the message and order need be linked. Amazon: - Be able to integrate Amazon's messages. Use Amazon API not email software. - Easily find related message on each order. And on each message can easily find out the order. So the message and order need be linked. 4. Amazon FBA: - Be able to get the inventory from one of Amazon's fulfillment centers - Be able to get all the availability inventory - Be able to do all functions for Fulfillment Outbound orders on Amazon's fulfillment centers (Create order, Get order, List all order, Get order tracking information, Cancel order and Get order status.) 5. Format: The delivered code must be java/php/html source code. It could not contain any compiled code or encrypted code.