Print USPS and DHL labels right from your WooCommerce dashboard and instantly save on shipping. WooCommerce Shipping is free to use and saves you time and money.
Allow you to use your own DHL and USPS accounts contracts.
You should be able to use your own account contracts (and associated API keys) with an option for low volume users to buy retail labels from through the plugin.
To use this plugin, we would definitely require the ability to use our own DHL account, and show live prices to the customer based on destination.