{"message":"Order Fulfillment API","version":"1.0.0","endpoints":{"POST /orders":"Submit new orders","GET /orders/{order_id}/shop/{shop_id}":"Get specific order by ID and shop","GET /orders/date/{date}":"Get orders by date","GET /orders/export/{date}":"Export orders by date as CSV (optional ?shop_id=X)","PUT /orders/{order_id}/shop/{shop_id}/tracking":"Update order tracking","DELETE /orders/{order_id}/shop/{shop_id}/items?sku=X":"Remove a pending line item before fulfillment","GET /health":"Health check"}}