Hey 
jumping in here as well.
This is actually covered here:
Short answer: Shopify checkout can’t be embedded directly into the Funnelish checkout.
Funnelish is designed to handle the full checkout experience itself, while Shopify is typically used for fulfillment through integrations and product automations.
If needed, you can technically send users to a Shopify checkout using a “Go to URL” button, but this isn’t recommended since it can break tracking and attribution across your funnel.
If you have a specific setup in mind, feel free to reach out to [email protected]
or through the bubble chat inside your dashboard and we’ll be happy to help.