Sidekick: Post-Purchase Upsell App + Follow-Up Email

Help me capture post-purchase upsell revenue without building a native one-click post-payment page (that requires Plus checkout extensibility and a developer):

Store name: [YOUR STORE NAME]
Shopify plan: [SHOPIFY / ADVANCED / PLUS]
Top-selling products: [LIST YOUR TOP 3-5 PRODUCTS]
Target upsell products: [PRODUCTS TO OFFER AS POST-PURCHASE UPSELLS]
Upsell discount: [PERCENTAGE OR DOLLAR DISCOUNT FOR POST-PURCHASE OFFERS]

Do the following:


  
    App recommendation - If I’m on Shopify/Advanced (not Plus), recommend a post-purchase upsell app from the Shopify App Store (for example ReConvert) and initiate installation.
  
  
    Flow-based upsell email - Build a Shopify Flow that triggers right after an order is placed and sends a follow-up email via Shopify Messaging offering [UPSELL PRODUCT] at [DISCOUNT], with a direct add-to-cart link.
  
  
    Offer copy - Draft the email copy: headline (“Add [PRODUCT] to your last order and save [DISCOUNT]%”), three benefit bullets, and a clear call-to-action button.
  
  
    Product matching - Set the Flow condition so it only fires for orders containing [PRODUCT A] and offers [UPSELL PRODUCT 1], with a default upsell for all other orders.
  
  
    Revenue tracking - Build a ShopifyQL report tagging orders that included the upsell discount code so I can track acceptance rate and additional revenue.
  


Tell me clearly whether the recommended path is the native Flow+email route or requires a Plus checkout extension.