Amazon Publisher — a compact FastAPI demo that reads product rows from Google Sheets, builds Amazon Listings-style JSON payloads (using local Product-Type schemas), validates them, and exposes preview + feeds endpoints.
- Purpose: validate & prepare Listings payloads from a spreadsheet in a reproducible, extendable demo.
- Mode: demo (no real SP-API calls; feeds are stubbed but flow is ready to wire to real SP-API).
- Tech: FastAPI, pydantic models, google-sheets API, local JSON schema validation, Docker.