A Shopify thank you page upsell is a product offer that appears after the order is placed, on the thank-you page or the order-status page. SK Checkout Customizer documents that block. It pulls products from a collection you choose or from a list you pick by hand, and it leaves out products the customer just bought.
That page is the non-Plus path. Shopify’s help on checkout configurations documents thank-you and order-status app blocks on Basic and higher, and it documents app blocks on the information, shipping, and payment steps as Plus. Shopify’s notes on thank-you extensions also put them on plans other than Starter. A Basic store should build the offer for the thank-you page. It should not plan to drop the same offer onto the payment step.
Where the block is allowed
The catalog names the surface directly: the order-status and thank-you pages, after checkout completes. The shopper has already paid. The offer is a second moment, not a change to the payment form.
Checkout UI extensions need a checkout extensibility context. Being on that system does not put every extension on every step. If you are on Basic, Grow, or Advanced, treat the checkout steps as closed unless the editor on your store shows otherwise. Plus is the plan Shopify Help uses for those steps. Starter should not be assumed to include the thank-you block either. Open the editor and look.
The app itself is free. There is no app tier that unlocks the thank-you upsell while hiding it on another tier. Shopify’s plan still decides the page.
What the thank-you upsell contains
You choose the source of the products. A collection keeps the offer aligned with a merchandised set. A manual list is better when you want three specific add-ons and nothing else. The block then checks the order’s line items and removes anything the shopper already purchased, using a Storefront query against that order. A person who just bought the candle does not see the candle again in the offer.
- Collection or manual list: those are the two sources the catalog documents.
- Purchased items excluded: the block compares candidates with the order’s line items.
- Carousel: more than one product can be browsed on the page.
- Discount banner: optional text or a banner alongside the products. The catalog does not say this banner creates a new payment by itself.
The catalog does not describe a one-click charge inside Shopify’s separate post-purchase payment extension. Test the button on a real order before you tell customers they can add the item without leaving the page. Describe what the button actually does in your store.
What the shopper can add
Pick products that make sense after the purchase, not a second copy of the hero product. A gift bag, a refill, or a care kit is easier to understand on a confirmation page than a unrelated high-ticket item. Keep the set small enough for a carousel. A long collection dumped onto a thank-you page is hard to scan on a phone.
Write the discount banner only if the code or the price is real. The catalog includes the banner as an option. It does not include an A/B test, a scheduler, or a revenue report for the block. If you later want to know whether the offer earned its place, count orders in Shopify that contain the add-on product. The app will not hand you that total.
US, UK, and Canadian stores use the same block. Currency and shipping copy are yours to write. The catalog does not translate the banner for you.
The thank-you page is what shoppers see immediately. The order-status page is what they open later from the email. Put the same block on both if your editor offers both targets, then place one test order and open the status link from the notification. A block that appears only on the first screen is easy to miss when someone returns the next day.
What to look at after the first orders
Place the block, place a test order, and open both the thank-you page and the order-status page. Confirm the purchased product is absent and the other products are present. Click through on a phone. Then leave the offer up for a period you choose, such as a week of normal traffic, and compare orders that include the offered product with the week before. That comparison is yours. It is not an in-app experiment.
- Confirm the collection or the manual list is published and in stock.
- Confirm a just-purchased item does not reappear.
- Read the discount banner against a real code if you turned the banner on.
- Note what the product button does, and describe only that behavior in your ads.
Leave the payment step alone on a non-Plus store
An order bump checkbox under the cart lines, a gift-wrap row before payment, and other checkout-step blocks are a Plus placement under Shopify Help. The thank-you upsell is the fallback for everyone else, and it happens later. The shopper has already committed. An offer there can still sell an add-on. It cannot change the order they just paid for unless the button you tested actually starts a new purchase.
If the only goal was a checkbox before the card is charged, a non-Plus store does not get that from this block. Say so in the brief to your team. Installing the app and hunting for a payment-step target will look like a bug.
Questions about a thank-you page upsell
Does this work on Basic?
Shopify Help documents thank-you and order-status app blocks on Basic and higher. Do not plan the same offer on the payment step unless the store is on Plus and the editor accepts the block.
Can the customer add the item in one click?
The catalog documents the product source, the exclusion of items just bought, a carousel, and an optional discount banner. It does not document a one-click second charge. Test the button on a live order.
Will the app tell me the revenue from the offer?
No. The catalog has no revenue analytics for checkout blocks. Count the add-on product on orders yourself.
Set the collection or the product list on SK Checkout Customizer, and install SK Checkout Customizer when the thank-you page is the page your plan allows.