If you plan to offer a sale on your Shopify store and would like the sale to sync in with the integration, you must set up your sale this way in or it will not sync.
1. Set your “Base price” to what the sale price is (sale price) .
2. Then set the “Compare at” price to the original price.
(Base Price/Compare at price)
Once you do this, it will then allow both your Shopify Store and the Marketplace to show the original (compare at) price with a strikethrough, and list the new price as a sale (indicated with a SALE tag on the product listing).
Still have questions or need support? Reference this article from Shopify Support to learn more: https://help.shopify.com/en/manual/products/details/product-pricing/sale-pricing