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Invalid Credentials
If you receive the “Invalid Credentials” error, it means that the data you pasted into our plugin is incorrect.
Please double-check if every character of these details is correct:
- DHL Express Account Number
- API Key
- API Secret
Additionally, please set a new demo site, activate the DHL Express Live Rates PRO, and paste your credentials. That will help to verify if there’s anything on your web hosting that’s blocking the connection.