Price changers

Shopify Plus

Price changers replace the price of cart lines at checkout. Prices can go down or up. Use them for deposits, price-matched items, wholesale pricing by tag, or add-ons priced as a percentage of the cart.

Function	Targets
Line item price changer	Variants you pick
Multi line item price changer	Products with any of the tags you enter

Plan: Deals & Rules or Buddy, on a Shopify Plus store. The app also needs permission to change cart prices; if the card says Reopen the app to approve new permissions, close Checkout Buddy, open it again and approve them. See app permissions.

Available on request for newer stores

For stores that installed Checkout Buddy on or after 1 February 2026, the price changer cards show Not publicly available. Enabled upon request. Email kyle@keylayapps.com with your store URL to have them turned on.

Settings

Line item price changer

• Variants applied to: The variants whose price changes.
• Only lines a Fee offer added: For fees, condition set 1 only. Only the lines a Product offers Fee offer added change price. Other lines of these products keep their price. A percentage of the cart total leaves out fees and Product offers’ gifts. Create price changer on a fee’s Fee card sets this up for you.
• Price change type: How the new price is worked out (see below).
• Items excluded from cart total: Only for Percentage (of cart total, excluding selected items).
• Amount: The price or percentage.

Multi line item price changer

• Product tags: Comma-separated tags, for example sale, clearance. Products with any of these tags are changed.
• Price change type and Amount, as above.

Price change type	New price for each unit
Fixed price	The amount
Fixed price multiple (multiplied by number of line items)	The amount × the number of lines in the cart
Fixed total price (regardless of quantity)	The amount ÷ quantity, so the line always totals the amount
Percentage (of original price)	That percentage of the current price. 70 means 30% off; 120 means 20% more
Percentage (of cart total)	That percentage of the cart’s line totals
Percentage (of cart total, excluding selected items)	Same, leaving out the excluded items. Line item price changer only: the Multi line item price changer doesn’t offer it. An older one that has it shows “Not supported by this customization. Choose another type.” and makes no price changes until you change it

Enter fixed amounts in your store’s currency; they’re converted to the customer’s currency.

Conditions

• Line item price changer, Condition set 1: Cart total, Cart products
• Line item price changer, Condition set 2: Cart total, Cart products, Cart attribute key and value, Customer tags, Customer metafield
• Multi line item price changer: Cart total, Cart products, Cart attribute key and value, Customer metafield, Customer tags, B2B customer exists / does not exist, Quantity of variants

Here Cart total is the sum of the line prices, before shipping and tax.

Things to know

• One per store. Shopify allows one cart transform function per app on each store, so your store can have one price changer at a time: a Line item price changer on condition set 1 or 2, or a Multi line item price changer. Put several products in one price changer by adding settings. Build a box needs the same cart transform, so a store with boxes can’t have a price changer, and the other way round.
• Tags are shared across settings in the Multi line item price changer. With two settings, each one applies to products carrying a tag from either setting. Use one setting per price changer if tags must stay separate.
• Not listed in Shopify admin. Price changers don’t appear anywhere in Shopify admin; manage them in Checkout Buddy only.
• Turning one off keeps it installed but stops it changing prices. Deleting it removes it from Shopify.
• The new price shows as the item’s price at checkout, not as a discount, so it doesn’t use discount combinations.