Commercial Invoice PDF Not Working

Hi,

We are trying to pull up the Commercial Invoice PDF but it does not work at all. Have already tried all available versions and results are just the same. In the response we only get shipping_documents[] array with either label or packing_slip.

Sample GET request:

https://api.easyship.com/2023-01/shipments/ESAU147297164?format=PDF&label=A4&packing_slip=A4&commercial_invoice=A4

Have already tried with just the format=PDF param but still doesn't work.

Any help would be appreciated. Thanks.