Line item upsell

A line item upsell adds a small link, such as “🎁 Subscribe & save”, under a product in the order summary. Clicking it opens a popover where the customer can switch that product to a subscription, or add a product that goes with it.

Requires: Shopify Plus and the Business plan.

Settings

Setting	What it does
Upsell type	Subscription upsell or Complementary add-on (requires Shopify Search & Discovery setup)
Text	The link under the product. Defaults to “Subscribe & save”.
CTA Text	The button in the popover. Defaults to “Subscribe”.
Text appearance	The link color: Base, Accent, Subdued, Info, Success, Warning, Critical, or Decorative
Text emphasis	None, Bold, or Italic
Icon	An icon before the text

There’s no product picker. The offer comes from the product it’s shown under.

Subscription upsell

The popover lists the product’s subscription plans, plus a quantity. Choosing a plan and clicking the button converts that cart item to a subscription. It doesn’t add a new product.

The link only shows under products that have subscription plans and aren’t already on one.

Complementary add-on

The popover shows the first complementary product you’ve set up for this product in Shopify’s Search & Discovery app, with a variant dropdown if needed. The button adds one of it to the cart.

The link hides when the product has no complementary products, or when one of them is already in the cart.

Place it under line items

Needs the line item location

This block only works under line items. In the Checkout Editor, place a Checkout Buddy or Checkout Buddy - Cart Line Item app block under the line items in the order summary. Anywhere else it shows nothing.

It appears under every product it applies to. To limit which products show it, use rules such as Target line item tags. See rules for a specific line item.

Things to know

• The add-on price in the popover always shows with a $ sign, so this option is best suited to stores that sell in dollars.
• Translations entered for this block aren’t used at checkout yet. Write the text in your checkout’s main language.
• Changes are blocked when the checkout doesn’t allow editing items, for example some B2B checkouts.