GET /track/shipments?trackingNumber=<n> with header DHL-API-Key. Same path, header and fields as
DHL Shipment Tracking – Unified (https://api-eu.dhl.com/track/shipments). It answers only the demo tracking numbers;
event times are relative to now.
GET /restock?product=<name or SKU>&colour=<c>&size=<s>. Reads the merchandising team's Google Sheet
live when one is configured (see /api/status); otherwise a bundled copy.