Advanced Shipment Tracking Plugin
The Advanced Shipment Tracking for WooCommerce plugin should be installed & active on your store to integrate TrackShip.
WooCommerce REST API enabled
The WooCommerce REST API should be enabled in your store.
Your store should be protected with SSL certificate, (HTTPS), Make sure that WordPress Address & Site Address are with HTTPS in
Settings > General
Pretty permalinks in
Settings > Permalinks is required so that the custom endpoints are supported. Default permalinks will not work.