If no tracking data is received after shipment registration, it may be due to the following reasons:
1. Data is still synchronizing:
There may be a 2-3 minute delay in returning results after initial registration. Please wait for the synchronization to complete.
2. Carrier Issues:
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The carrier is registered incorrectly. In this case, the system cannot retrieve the correct tracking data. Verify the carrier registration.
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The carrier is registered correctly, but tracking information may not have been updated yet, resulting in a "Not Found" status.
*By default, the "Not Found" status is not pushed to the user. Check the API backend settings to ensure this status is enabled if notifications are needed.