It seems like Shopify has updated their Buy Button embed code. I'll be updating our help doc to reflect this, but I just wanted to give you all a quick heads up on how to fix your Webflow dynamic embed to work with the new code.
1. Copy the Buy Button code
2. Find the Product ID in your code
3. Put that product ID in your dynamic collection item
4. Paste the full code in a embed on a dynamic template page
5. Replace the product ID with a dynamic field and add a '\' in the amount
hope this helps