I'm surprised Weblfow is not on the list of e-commerce vendors that Shippo used to connect and sync the orders with. Shippo is one of two vendor Stripe payment offer in their ordering integration, yet Webflow neglect to get it working with Shippo or EasyPost.
This integration launched on April 23, 2020. https://webflow.com/feature/streamline-your-shipping-process-with-a-new-shippo-integration-for-ecommerce