The Demo key only works for the demo tool on the documentation page; it will return a mockup response. The Demo key can not be used for testing with real shipment tracking numbers. To start doing testing, please get access to the API and use the provided API key from the app where you added this API. You can learn more about it here: How to add my API Key on Postman to test the Shipment Tracking - Unified API? : API Developer Portal Support (dhl.com).
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