The one thing to remember: this is a UI demo, not a Postman demo. Ganga wants to see a seller do each task inside your website — "show the item life cycle in your website", "how the error message is displayed to the sellers", "show Feed IDs to the seller". The raw request/response proof was the earlier Verification Phase (the validation .txt bundle — already submitted).
Item lifecycle + OAuth run on the pilot (real production connection — real feed IDs, real errors). Orders & returns run in the sandbox: every pilot order is already in a terminal state (Delivered/Shipped/Cancelled), so there is no fresh order to acknowledge/ship — and Walmart explicitly accepts sandbox validation for orders/returns. Keep both logged-in tabs open; switch tabs at the marked handoff.
Ganga's centerpiece. Start here — it frames the whole "seller's perspective" demo.
Switch to the sandbox-connected tab. These use fresh simulation orders because no pilot order is in an actionable state, and Walmart accepts sandbox for orders/returns.