Hi mari0bros,
You are not using the correct API credentials.
Please go through the below method to get these credentials:
Getting SiteID and password for countries other than United States (UK and Rest of the world)
The customer should contact DHL account manager.
The account manager must request integration with WooForce via DHL Presales department.
Presales will then provide the customer with live credentials.
Getting SiteID and Password for United States
You need to write to [email protected] along with your full Account details like account number, region, address, etc. to get API Access.
For a detailed explanation of this, you can refer our settings up article – https://support.wooforce.com/hc/en-us/articles/207077395-Setting-Up-WooCommerce-DHL-Express-Plugin.
