When processing orders, you might come across the "Failed to fetch DHL Global Mail rates: Rates service returned error code: 400 {"errorMessage":"JSON validation failed: value must be greater than 0. Hint: /packageDetails/height}" error.
This error is shown when a package (or more) within your orders is missing height information.
Feel free to follow this video guide, or the step-by-step procedure below.
To solve this issue you will have to:
- Click the Edit button of the order that contains the box you need to correct
- Select the Packaging tab; this tab shows a list of all the boxes included in the order
- Add the height of the boxes as required
- Press Save to commit the changes
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