Sidekick: Set Up Post-Purchase Upsell Page

Help me create a post-purchase upsell page for my Shopify store:

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]

Set up the post-purchase upsell page:


  
    Page placement - Configure the upsell page to appear after the customer clicks “Pay now” and the payment is processed, but before the thank you page. This is the highest-converting moment because the customer has already committed to buying.
  
  Offer design - Create a clean, single-focus offer page showing one upsell product with:
    
      A compelling headline: “Wait! Add [PRODUCT] to your order and save [DISCOUNT]%”
      A high-quality product image
      Three bullet points highlighting key benefits
      The original price crossed out with the discounted price shown
      A countdown timer creating urgency (for example, “Offer expires in 5:00”)
    
  
  
    One-click accept - The customer should be able to add the upsell with a single button click. No need to re-enter payment information. The additional charge is added to the same payment method automatically.
  
  
    Decline option - Include a clear “No thanks, continue to my order” link below the accept button. Never hide the decline option or make it difficult to find.
  
  Product matching rules - Set up rules for which upsell products appear based on the original purchase:
    
      If cart contains [PRODUCT A], show [UPSELL PRODUCT 1]
      If cart contains [PRODUCT B], show [UPSELL PRODUCT 2]
      Default upsell for all other orders: [DEFAULT UPSELL PRODUCT]
    
  
  
    Downsell option - If the customer declines the first offer, show a second lower-priced offer or the same product at a higher discount. Limit to a maximum of 2 offers total to avoid frustrating the customer.
  
  
    Revenue tracking - Track post-purchase upsell revenue separately. Monitor acceptance rate, average upsell order value, and total additional revenue generated per month.
  
  Mobile optimization - Ensure the upsell page is fully responsive. On mobile, stack the image above the offer text and make the accept button full-width and easy to tap.


Recommend the best Shopify app for post-purchase upsells and provide the configuration steps.