When calling the tracking API for a carrier that requires credentials (such as UPS, DHL, or FedEx), Ship&co previously returned a generic "Tracking number not found" error — even when the real cause was a missing carrier account.
The API now returns a descriptive message: "No active carrier found for {carrier}. Please configure your {carrier} account to use tracking." This makes it much easier to diagnose the issue and get tracking working quickly.
Japan Post, Yamato, and Sagawa are not affected by this change as they do not require credentials for tracking.
