Asendia USA wanted to offer a direct integration to Shopify to the customers, so they approached us with the project. We built and maintain their Shopify which allows their clients to offer live rates in checkout, and print labels for their orders prior to sending the to Asendia for consolidation. We manage the app day to day as well as monitoring and scaling the app during peak holiday season traffic spikes and multiple high volume Shopify Plus stores using the app.
The app is published (unlisted) on the Shopify app store. You should contact your Asendia USA representative to get live rates and API credentials for installation into your Shopify store.