How do I handle Australia Post + StarTrack shipping in Magento?

Australia Post ships an official Magento 2 module (free) that wires their MyPost Business API for ParcelPost (regular), Express Post (next-day metro), and StarTrack (B2B / large-parcel / regional). The module handles real-time rate quoting at checkout, label printing, manifesting, and tracking events. StarTrack is Australia Post’s premium B2B / regional service, same module covers it. For multi-warehouse stores (e.g. Sydney + Melbourne), we wire ShipperHQ on top so the cart picks the closest warehouse based on postcode + product availability + carrier-rate-shopping. We also build custom routing rules for rural / NT / TAS where Australia Post has different SLAs and StarTrack is often more cost-effective for parcels > 5kg.