Wix Stores Request: Offering Upsells and Cross-sells in the Cart and Checkout Pages

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Currently, Wix doesn't have an integrated solution which offers customers cross-sells or upsells on the Cart Page or Checkout Page. 
Update:
It's now possible to offer cross-sells and upsells through the ReConvert third party app.
We are always working to update and improve our products, and your feedback is greatly appreciated.