At this time, ShipStation does not send live rates to your selling channels for your customers to select at checkout. Most selling channels provide access to plug-ins so you can provide live rates from your carrier account to your customers during the checkout process. You will need to contact your selling channel for details.
DHL Express Rates in Shopify
If you are shipping internationally with DHL Express via ShipStation Carrier Services and use Shopify as your selling channel, you do have the option to show your customers the same rate rates you have access to in ShipStation.
For further details and instructions, please review the Sync DHL Express Rates in Shopify Checkout in our ShipStation Carrier Services: DHL Express article.