Ebay api - show and tell session

This project is about Ebay API show and tell session

You are expected to show me using Ebay API Explorer.(This is because I have not got an account yet).

Topic need to cover
- BulkDataExchangeService
- FileTransferService
- Sell APIs ( Inventory + Fulfillment +Feed)
- Notification API

Especially createOrderTask method need to cover
https://developer.ebay.com/api-docs/sell/feed/resources/methods#h2task

And the session will be recorded and you are expected to show me round trip of the above topic.
it is expected to be just 45 mins or 90 mins