Cart Line Items

Cart Line Items lets you control which UI controls appear on each product in the checkout cart (quantity stepper, variant selector, and remove button) and optionally display a dynamic message or badge on individual line items.

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How to set up

1. Go to Cart Line Items in the app.
2. Configure display settings (see below).
3. Add Display Rules as per your requirement.
4. Click Save.
5. In the Shopify checkout editor, add the Cart Line Item Controls block to the checkout page.

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Display settings

Controls

Setting	Description
Status	Toggle to enable or disable the extension
Show quantity stepper	Lets customers increase or decrease Item quantity in the cart
Show variant selector	Lets customers switch variant (size, colour, etc.) without leaving checkout
Show remove button	Lets customers remove items from the cart during checkout

Line Item Message

Setting	Description
Message text	The text to display. Supports dynamic placeholders (see below)
Appearance	How the message looks: Plain text, Success (green), Warning (yellow), or Critical (red)
Visibility conditions	Show the message only when a specific line item property or cart attribute key (and optionally value) matches

Supported placeholders in message text:

Placeholder	What it shows
{{ sku }}	The product’s SKU
{{ property:key }}	A line item property value (e.g. {{ property:gift_message }})
{{ cart_attribute:key }}	A cart attribute value

Notes

• Supports conditions. You can show or hide controls based on cart total, product tags, customer tags, and more.
• Visibility conditions on the line item message are separate from the main extension conditions and target individual line items rather than the whole cart.
• Shows on checkout only.

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Use cases

Scenario	Conditions to set
Show a “Personalised” badge on custom products	Visibility condition: line item property key = personalised
Show quantity stepper only for repeat buyers	Extension conditions: Customer order count is greater than 0
Show a warning badge on items with long lead times	Visibility condition: line item property key = lead_time, show Warning appearance
Show the SKU for B2B customers who reference it in orders	Extension conditions: Customer tag contains wholesale, use {{ sku }} in message

Best practices

• Only enable the controls your customers genuinely need. Showing all three (quantity, variant, remove) clutters the cart.
• Use the Warning appearance for messages like “This item ships in 5–7 days” to visually flag it without alarming the customer.
• Use line item property placeholders ({{ property:key }}) to surface custom product data (engraving text, personalisation, monogram) directly in the cart.
• Test with products that have and don’t have the property set to ensure the message visibility conditions work as expected in both cases.