{"ok":true,"service":"SupplierHub","version":"v1","docs":"https://sup.net-tw.net/docs/api.md","endpoints":{"GET  /api/v1/products?since=YYYY-MM-DD&page=1&limit=100":"商品列表（增量 / 分頁 / ETag）","GET  /api/v1/product?sku=XXX":"單一商品（含階梯價）","GET  /api/v1/price-changes?since=...":"價格變動歷史","POST /api/v1/orders":"建立 B2B 訂單","GET  /api/v1/order?order_no=XXX":"查詢訂單"},"auth":{"header":"X-API-Key","optional_signature":{"X-API-Timestamp":"unix epoch seconds","X-API-Signature":"sha256=hmac_sha256(secret, ts.METHOD.path.body)"}}}