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Anchor to Cart Transform Function APICart Transform Function API

A cart represents the merchandise that a customer intends to purchase, and the estimated cost associated with the cart. Transforming a cart refers to changing the pricing and presentation of items in a cart. To modify the appearance of cart items, such as updating titles and images, changing prices, and bundling items, you can only use the Cart Transform API.

Shopify Functions enable you to customize Shopify's backend logic. The Cart Transform API integrates this logic into the checkout flow.

Use the API to add product bundles to a store or break down bundled products into individual components, with associated data such as buyer identity, quantity, cost, and subscription information.

Note

You can install a maximum of one Cart Transform Function on each store.

Anchor to Use casesUse cases

Expand a cart line item to display the bundled items it contains.
Merge multiple cart lines into a single line that represents a bundle.
Update the presentation of line items in a cart to override their price, title, or image.

Note

Only development stores or stores on a Shopify Plus plan can use apps with update operations.

Compatibility with Shopify surfaces

Supported (7)

Partially supported (1)

Unsupported (5)

B2B

Cart

Checkout

Shopify rejects expand, merge, and update operations if a selling plan is present.

Create Order API

Draft Order (Admin)

Draft Order (Checkout)

Order Edit (Admin)

Order Edit (Checkout)

POS

Shopify Admin

Storefront

Storefront Accelerated Checkout

Subscription (Recurring Orders)

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Anchor to Getting startedGetting started

Scaffolding the Function using Shopify CLI will automatically configure your TOML file. You can alter the default configuration to customize the way your Function operates.

TutorialAdd a customized bundle Function

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Anchor to TargetsTargets

A target is an identifier in shopify.extension.toml that specifies where you're injecting code into Shopify Function APIs, or other parts of the Shopify platform. Each target is composed of three to four namespaces. The name begins with a broad Shopify context and ends with the behavior of the extensible element.

Anchor to Run targetRun target

purchase.cart-transform.run

The run target modifies the pricing and presentation of items in a cart either using Shopify data or hardcoded values. The target returns a list of operations to be applied to cart line items.

For example, you might use this to automatically add a warranty when a specific product is added to a cart.

Input

OBJECT

The Input object is the complete GraphQL schema that your Function can query as input to customize the presentation of items in a cart. Your Function receives only the fields that you request in the input query. To optimize performance, we highly recommend that you request only the fields that your Function requires.

cart

•

Cart!

non-null

The cart where the Function is running. A cart contains the merchandise that a customer intends to purchase and information about the customer, such as the customer's email address and phone number.

attribute

•

Attribute

The custom attributes associated with a cart to store additional information. Cart attributes allow you to collect specific information from customers on the Cart page, such as order notes, gift wrapping requests, or custom product details. Attributes are stored as key-value pairs.

Anchor to keykey • String: The key of the cart attribute to retrieve. For example, "gift_wrapping".

Anchor to keykey • String! non-null: The key or name of the attribute. For example, "customer_first_order".
Anchor to valuevalue • String: The value of the attribute. For example, "true".

buyerIdentity

•

BuyerIdentity

Information about the customer that's interacting with the cart. It includes details such as the customer's email and phone number, and the total amount of money the customer has spent in the store. This information helps personalize the checkout experience and ensures that accurate pricing and delivery options are displayed to customers.

customer

•

Customer

The customer that's interacting with the cart. A customer is a buyer who has an account with the store.

amountSpent

•

MoneyV2!

non-null

The total amount that the customer has spent on orders. The amount is converted from the shop's currency to the currency of the cart using a market rate.

amount

•

Decimal!

non-null

A monetary value in decimal format, allowing for precise representation of cents or fractional currency. For example, 12.99.

currencyCode

•

CurrencyCode!

non-null

The three-letter currency code that represents a world currency used in a store. Currency codes include standard standard ISO 4217 codes, legacy codes, and non-standard codes. For example, USD.

AED, AFN, ALL, AMD, ANG, AOA, ARS, AUD, AWG, AZN, BAM, BBD, BDT, BGN, BHD, BIF, BMD, BND, BOB, BRL, BSD, BTN, BWP, BYN, BZD, CAD, CDF, CHF, CLP, CNY, COP, CRC, CVE, CZK, DJF, DKK, DOP, DZD, EGP, ERN, ETB, EUR, FJD, FKP, GBP, GEL, GHS, GIP, GMD, GNF, GTQ, GYD, HKD, HNL, HRK, HTG, HUF, IDR, ILS, INR, IQD, IRR, ISK, JEP, JMD, JOD, JPY, KES, KGS, KHR, KID, KMF, KRW, KWD, KYD, KZT, LAK, LBP, LKR, LRD, LSL, LTL, LVL, LYD, MAD, MDL, MGA, MKD, MMK, MNT, MOP, MRU, MUR, MVR, MWK, MXN, MYR, MZN, NAD, NGN, NIO, NOK, NPR, NZD, OMR, PAB, PEN, PGK, PHP, PKR, PLN, PYG, QAR, RON, RSD, RUB, RWF, SAR, SBD, SCR, SDG, SEK, SGD, SHP, SLL, SOS, SRD, SSP, STN, SYP, SZL, THB, TJS, TMT, TND, TOP, TRY, TTD, TWD, TZS, UAH, UGX, USD, UYU, UZS, VED, VES, VND, VUV, WST, XAF, XCD, XOF, XPF, XXX, YER, ZAR, ZMW, BYR, STD, VEF

displayName

•

String!

non-null

The full name of the customer, based on the values for firstName and lastName. If firstName and lastName aren't specified, then the value is the customer's email address. If the email address isn't specified, then the value is the customer's phone number.

•

String

The customer's email address.

firstName

•

String

The customer's first name.

hasAnyTag

•

Boolean!

non-null

Whether the customer is associated with any of the specified tags. The customer must have at least one tag from the list to return true.

hasTags

•

[HasTagResponse!]!

non-null

Whether the customer is associated with the specified tags. The customer must have all of the tags in the list to return true.

Anchor to tagstags • [String!]! required: A comma-separated list of searchable keywords that are associated with the customer. For example, "VIP, Gold" returns customers with both the VIP and Gold tags.

Anchor to hasTaghasTag • Boolean! non-null: Whether the Shopify resource has the tag.
Anchor to tagtag • String! non-null: A searchable keyword that's associated with a Shopify resource, such as a product or customer. For example, a merchant might apply the sports and summer tags to products that are associated with sportswear for summer.

•

ID!

non-null

A globally-unique ID for the customer.

lastName

•

String

The customer's last name.

metafield

•

Metafield

A custom field that stores additional information about a Shopify resource, such as products, orders, and many more. Using metafields with Shopify Functions enables you to customize the checkout experience.

Anchor to namespacenamespace • String: A category that organizes a group of metafields. Namespaces are used to prevent naming conflicts between different apps or different parts of the same app. If omitted, then the app-reserved namespace is used.
Anchor to keykey • String! required: The unique identifier for the metafield within its namespace. A metafield is composed of a namespace and a key, in the format namespace.key.

Anchor to jsonValuejsonValue • JSON! non-null: The data that's stored in the metafield, using JSON format.
Anchor to typetype • String! non-null: The type of data that the metafield stores in the value field.
Anchor to valuevalue • String! non-null: The data that's stored in the metafield. The data is always stored as a string, regardless of the metafield's type.

numberOfOrders

•

Int!

non-null

The total number of orders that the customer has made at the store.

•

String

The email address of the customer that's interacting with the cart.

isAuthenticated

•

Boolean!

non-null

Whether the customer is authenticated through their customer account. If the customer is authenticated, then the customer field returns the customer's information. If the customer isn't authenticated, then the customer field returns null.

phone

•

String

The phone number of the customer that's interacting with the cart.

purchasingCompany

•

PurchasingCompany

The company of a B2B customer that's interacting with the cart. Used to manage and track purchases made by businesses rather than individual customers.

company

•

Company!

non-null

The company associated to the order or draft order.

createdAt

•

DateTime!

non-null

The date and time (ISO 8601 format) at which the company was created in Shopify.

externalId

•

String

A unique externally-supplied ID for the company.

•

ID!

non-null

The ID of the company.

metafield

•

Metafield

Anchor to namespacenamespace • String: A category that organizes a group of metafields. Namespaces are used to prevent naming conflicts between different apps or different parts of the same app. If omitted, then the app-reserved namespace is used.
Anchor to keykey • String! required: The unique identifier for the metafield within its namespace. A metafield is composed of a namespace and a key, in the format namespace.key.

Anchor to jsonValuejsonValue • JSON! non-null: The data that's stored in the metafield, using JSON format.
Anchor to typetype • String! non-null: The type of data that the metafield stores in the value field.
Anchor to valuevalue • String! non-null: The data that's stored in the metafield. The data is always stored as a string, regardless of the metafield's type.

name

•

String!

non-null

The name of the company.

updatedAt

•

DateTime!

non-null

The date and time (ISO 8601 format) at which the company was last modified.

contact

•

CompanyContact

The company contact associated to the order or draft order.

Anchor to createdAtcreatedAt • DateTime! non-null: The date and time (ISO 8601 format) at which the company contact was created in Shopify.
Anchor to idid • ID! non-null: The ID of the company.
Anchor to localelocale • String: The company contact's locale (language).
Anchor to titletitle • String: The company contact's job title.
Anchor to updatedAtupdatedAt • DateTime! non-null: The date and time (ISO 8601 format) at which the company contact was last modified.

location

•

CompanyLocation!

non-null

The company location associated to the order or draft order.

createdAt

•

DateTime!

non-null

The date and time (ISO 8601 format) at which the company location was created in Shopify.

externalId

•

String

A unique externally-supplied ID for the company.

•

ID!

non-null

The ID of the company.

locale

•

String

The preferred locale of the company location.

metafield

•

Metafield

Anchor to namespacenamespace • String: A category that organizes a group of metafields. Namespaces are used to prevent naming conflicts between different apps or different parts of the same app. If omitted, then the app-reserved namespace is used.
Anchor to keykey • String! required: The unique identifier for the metafield within its namespace. A metafield is composed of a namespace and a key, in the format namespace.key.

Anchor to jsonValuejsonValue • JSON! non-null: The data that's stored in the metafield, using JSON format.
Anchor to typetype • String! non-null: The type of data that the metafield stores in the value field.
Anchor to valuevalue • String! non-null: The data that's stored in the metafield. The data is always stored as a string, regardless of the metafield's type.

name

•

String!

non-null

The name of the company location.

updatedAt

•

DateTime!

non-null

The date and time (ISO 8601 format) at which the company location was last modified.

lines

•

[CartLine!]!

non-null

The items in a cart that the customer intends to purchase. A cart line is an entry in the customer's cart that represents a single unit of a product variant. For example, if a customer adds two different sizes of the same t-shirt to their cart, then each size is represented as a separate cart line.

attribute

•

Attribute

Cart line attributes are equivalent to the line_item object in Liquid.

Anchor to keykey • String: The key of the cart attribute to retrieve. For example, "gift_wrapping".

Anchor to keykey • String! non-null: The key or name of the attribute. For example, "customer_first_order".
Anchor to valuevalue • String: The value of the attribute. For example, "true".

cost

•

CartLineCost!

non-null

The cost of an item in a cart that the customer intends to purchase. Cart lines are entries in the customer's cart that represent a single unit of a product variant. For example, if a customer adds two different sizes of the same t-shirt to their cart, then each size is represented as a separate cart line.

amountPerQuantity

•

MoneyV2!

non-null

The cost of a single unit. For example, if a customer purchases three units of a product that are priced at $10 each, then the amountPerQuantity is $10.

amount

•

Decimal!

non-null

A monetary value in decimal format, allowing for precise representation of cents or fractional currency. For example, 12.99.

currencyCode

•

CurrencyCode!

non-null

The three-letter currency code that represents a world currency used in a store. Currency codes include standard standard ISO 4217 codes, legacy codes, and non-standard codes. For example, USD.

compareAtAmountPerQuantity

•

MoneyV2

The cost of a single unit before any discounts are applied. This field is used to calculate and display savings for customers. For example, if a product's compareAtAmountPerQuantity is $25 and its current price is $20, then the customer sees a $5 discount. This value can change based on the buyer's identity and is null when the value is hidden from buyers.

amount

•

Decimal!

non-null

A monetary value in decimal format, allowing for precise representation of cents or fractional currency. For example, 12.99.

currencyCode

•

CurrencyCode!

non-null

The three-letter currency code that represents a world currency used in a store. Currency codes include standard standard ISO 4217 codes, legacy codes, and non-standard codes. For example, USD.

subtotalAmount

•

MoneyV2!

non-null

The cost of items in the cart before applying any discounts to certain items. This amount serves as the starting point for calculating any potential savings customers might receive through promotions or discounts.

amount

•

Decimal!

non-null

A monetary value in decimal format, allowing for precise representation of cents or fractional currency. For example, 12.99.

currencyCode

•

CurrencyCode!

non-null

The three-letter currency code that represents a world currency used in a store. Currency codes include standard standard ISO 4217 codes, legacy codes, and non-standard codes. For example, USD.

totalAmount

•

MoneyV2!

non-null

The total cost of items in a cart.

amount

•

Decimal!

non-null

A monetary value in decimal format, allowing for precise representation of cents or fractional currency. For example, 12.99.

currencyCode

•

CurrencyCode!

non-null

The three-letter currency code that represents a world currency used in a store. Currency codes include standard standard ISO 4217 codes, legacy codes, and non-standard codes. For example, USD.

•

ID!

non-null

The ID of the cart line.

merchandise

•

Merchandise!

non-null

The item that the customer intends to purchase.

CustomProduct

•OBJECT

A custom product represents a product that doesn't map to Shopify's standard product categories. For example, you can use a custom product to manage gift cards, shipping requirements, localized product information, or weight measurements and conversions.

isGiftCard

•

Boolean!

non-null

Whether the merchandise is a gift card.

requiresShipping

•

Boolean!

non-null

Whether the item needs to be shipped to the customer. For example, a digital gift card doesn't need to be shipped, but a t-shirt does need to be shipped.

title

•

String!

non-null

The localized name for the product that displays to customers. The title is used to construct the product's handle, which is a unique, human-readable string of the product's title. For example, if a product is titled "Black Sunglasses", then the handle is black-sunglasses.

weight

•

Float

The product variant's weight, in the system of measurement set in the weightUnit field.

weightUnit

•

WeightUnit!

non-null

The unit of measurement for weight.

GRAMS, KILOGRAMS, OUNCES, POUNDS

ProductVariant

•OBJECT

A specific version of a product that comes in more than one option, such as size or color. For example, if a merchant sells t-shirts with options for size and color, then a small, blue t-shirt would be one product variant and a large, blue t-shirt would be another.

•

ID!

non-null

A globally-unique ID for the product variant.

metafield

•

Metafield

Anchor to namespacenamespace • String: A category that organizes a group of metafields. Namespaces are used to prevent naming conflicts between different apps or different parts of the same app. If omitted, then the app-reserved namespace is used.
Anchor to keykey • String! required: The unique identifier for the metafield within its namespace. A metafield is composed of a namespace and a key, in the format namespace.key.

Anchor to jsonValuejsonValue • JSON! non-null: The data that's stored in the metafield, using JSON format.
Anchor to typetype • String! non-null: The type of data that the metafield stores in the value field.
Anchor to valuevalue • String! non-null: The data that's stored in the metafield. The data is always stored as a string, regardless of the metafield's type.

product

•

Product!

non-null

The product associated with the product variant. For example, if a merchant sells t-shirts with options for size and color, then a small, blue t-shirt would be one product variant and a large, blue t-shirt would be another. The product associated with the product variant would be the t-shirt itself.

handle

•

Handle!

non-null

A unique, human-readable string of the product's title. A handle can contain letters, hyphens (-), and numbers, but not spaces. The handle is used in the online store URL for the product. For example, if a product is titled "Black Sunglasses", then the handle is black-sunglasses.

hasAnyTag

•

Boolean!

non-null

Whether the product is associated with any of the specified tags. The product must have at least one tag from the list to return true.

hasTags

•

[HasTagResponse!]!

non-null

Whether the product is associated with the specified tags. The product must have all of the tags in the list to return true.

Anchor to tagstags • [String!]! required: A comma-separated list of searchable keywords that are associated with the product. For example, "sports, summer" returns products with both the sports and summer tags.

Anchor to hasTaghasTag • Boolean! non-null: Whether the Shopify resource has the tag.
Anchor to tagtag • String! non-null: A searchable keyword that's associated with a Shopify resource, such as a product or customer. For example, a merchant might apply the sports and summer tags to products that are associated with sportswear for summer.

•

ID!

non-null

A globally-unique ID for the product.

inAnyCollection

•

Boolean!

non-null

Whether the product is in any of the specified collections. The product must be in at least one collection from the list to return true.

A collection is a group of products that can be displayed in online stores and other sales channels in categories, which makes it easy for customers to find them. For example, an athletics store might create different collections for running attire and accessories.

inCollections

•

[CollectionMembership!]!

non-null

Whether the product is in the specified collections. The product must be in all of the collections in the list to return true.

Anchor to idsids • [ID!]! required: A comma-separated list of globally-unique collection IDs that are associated with the product. For example, gid://shopify/Collection/123, gid://shopify/Collection/456.

Anchor to collectionIdcollectionId • ID! non-null: A globally-unique ID for the collection.
Anchor to isMemberisMember • Boolean! non-null: Whether the product is in the specified collection.

isGiftCard

•

Boolean!

non-null

Whether the product is a gift card.

metafield

•

Metafield

Anchor to namespacenamespace • String: A category that organizes a group of metafields. Namespaces are used to prevent naming conflicts between different apps or different parts of the same app. If omitted, then the app-reserved namespace is used.
Anchor to keykey • String! required: The unique identifier for the metafield within its namespace. A metafield is composed of a namespace and a key, in the format namespace.key.

Anchor to jsonValuejsonValue • JSON! non-null: The data that's stored in the metafield, using JSON format.
Anchor to typetype • String! non-null: The type of data that the metafield stores in the value field.
Anchor to valuevalue • String! non-null: The data that's stored in the metafield. The data is always stored as a string, regardless of the metafield's type.

productType

•

String

A custom category for a product. Product types allow merchants to define categories other than the ones available in Shopify's standard product categories.

title

•

String!

non-null

vendor

•

String

The name of the product's vendor.

requiresShipping

•

Boolean!

non-null

Whether the item needs to be shipped to the customer. For example, a digital gift card doesn't need to be shipped, but a t-shirt does need to be shipped.

sku

•

String

A case-sensitive identifier for the product variant in the merchant's store. For example, "BBC-1". A product variant must have a SKU to be connected to a fulfillment service.

title

•

String

The localized name for the product variant that displays to customers.

weight

•

Float

The product variant's weight, in the system of measurement set in the weightUnit field.

weightUnit

•

WeightUnit!

non-null

The unit of measurement for weight.

GRAMS, KILOGRAMS, OUNCES, POUNDS

quantity

•

Int!

non-null

The quantity of the item that the customer intends to purchase.

sellingPlanAllocation

•

SellingPlanAllocation

The selling plan associated with the cart line, including information about how a product variant can be sold and purchased.

priceAdjustments

•

[SellingPlanAllocationPriceAdjustment!]!

non-null

A list of price adjustments, with a maximum of two. When there are two, the first price adjustment goes into effect at the time of purchase, while the second one starts after a certain number of orders. A price adjustment represents how a selling plan affects pricing when a variant is purchased with a selling plan. Prices display in the customer's currency if the shop is configured for it.

perDeliveryPrice

•

MoneyV2!

non-null

The effective price for a single delivery. For example, for a prepaid subscription plan that includes 6 deliveries at the price of $48.00, the per delivery price is $8.00.

amount

•

Decimal!

non-null

A monetary value in decimal format, allowing for precise representation of cents or fractional currency. For example, 12.99.

currencyCode

•

CurrencyCode!

non-null

The three-letter currency code that represents a world currency used in a store. Currency codes include standard standard ISO 4217 codes, legacy codes, and non-standard codes. For example, USD.

price

•

MoneyV2!

non-null

The price of the variant when it's purchased with a selling plan For example, for a prepaid subscription plan that includes 6 deliveries of $10.00 granola, where the customer gets 20% off, the price is 6 x $10.00 x 0.80 = $48.00.

amount

•

Decimal!

non-null

A monetary value in decimal format, allowing for precise representation of cents or fractional currency. For example, 12.99.

currencyCode

•

CurrencyCode!

non-null

The three-letter currency code that represents a world currency used in a store. Currency codes include standard standard ISO 4217 codes, legacy codes, and non-standard codes. For example, USD.

sellingPlan

•

SellingPlan!

non-null

A representation of how products and variants can be sold and purchased. For example, an individual selling plan could be '6 weeks of prepaid granola, delivered weekly'.

description

•

String

The description of the selling plan.

•

ID!

non-null

A globally-unique identifier.

metafield

•

Metafield

Anchor to namespacenamespace • String: A category that organizes a group of metafields. Namespaces are used to prevent naming conflicts between different apps or different parts of the same app. If omitted, then the app-reserved namespace is used.
Anchor to keykey • String! required: The unique identifier for the metafield within its namespace. A metafield is composed of a namespace and a key, in the format namespace.key.

Anchor to jsonValuejsonValue • JSON! non-null: The data that's stored in the metafield, using JSON format.
Anchor to typetype • String! non-null: The type of data that the metafield stores in the value field.
Anchor to valuevalue • String! non-null: The data that's stored in the metafield. The data is always stored as a string, regardless of the metafield's type.

name

•

String!

non-null

The name of the selling plan. For example, '6 weeks of prepaid granola, delivered weekly'.

recurringDeliveries

•

Boolean!

non-null

Whether purchasing the selling plan will result in multiple deliveries.

cartTransform

•

CartTransform!

non-null

A customization that changes the pricing and presentation of items in a cart. For example, you can modify the appearance of cart items, such as updating titles and images, or bundling items.

metafield

•

Metafield

Anchor to namespacenamespace • String: A category that organizes a group of metafields. Namespaces are used to prevent naming conflicts between different apps or different parts of the same app. If omitted, then the app-reserved namespace is used.
Anchor to keykey • String! required: The unique identifier for the metafield within its namespace. A metafield is composed of a namespace and a key, in the format namespace.key.

Anchor to jsonValuejsonValue • JSON! non-null: The data that's stored in the metafield, using JSON format.
Anchor to typetype • String! non-null: The type of data that the metafield stores in the value field.
Anchor to valuevalue • String! non-null: The data that's stored in the metafield. The data is always stored as a string, regardless of the metafield's type.

localization

•

Localization!

non-null

The regional and language settings that determine how the Function handles currency, numbers, dates, and other locale-specific values during discount calculations. These settings are based on the store's configured localization practices.

country

•

Country!

non-null

The country for which the store is customized, reflecting local preferences and regulations. Localization might influence the language, currency, and product offerings available in a store to enhance the shopping experience for customers in that region.

isoCode

•

CountryCode!

non-null

The ISO code of the country.

AC, AD, AE, AF, AG, AI, AL, AM, AN, AO, AR, AT, AU, AW, AX, AZ, BA, BB, BD, BE, BF, BG, BH, BI, BJ, BL, BM, BN, BO, BQ, BR, BS, BT, BV, BW, BY, BZ, CA, CC, CD, CF, CG, CH, CI, CK, CL, CM, CN, CO, CR, CU, CV, CW, CX, CY, CZ, DE, DJ, DK, DM, DO, DZ, EC, EE, EG, EH, ER, ES, ET, FI, FJ, FK, FO, FR, GA, GB, GD, GE, GF, GG, GH, GI, GL, GM, GN, GP, GQ, GR, GS, GT, GW, GY, HK, HM, HN, HR, HT, HU, ID, IE, IL, IM, IN, IO, IQ, IR, IS, IT, JE, JM, JO, JP, KE, KG, KH, KI, KM, KN, KP, KR, KW, KY, KZ, LA, LB, LC, LI, LK, LR, LS, LT, LU, LV, LY, MA, MC, MD, ME, MF, MG, MK, ML, MM, MN, MO, MQ, MR, MS, MT, MU, MV, MW, MX, MY, MZ, NA, NC, NE, NF, NG, NI, NL, NO, NP, NR, NU, NZ, OM, PA, PE, PF, PG, PH, PK, PL, PM, PN, PS, PT, PY, QA, RE, RO, RS, RU, RW, SA, SB, SC, SD, SE, SG, SH, SI, SJ, SK, SL, SM, SN, SO, SR, SS, ST, SV, SX, SY, SZ, TA, TC, TD, TF, TG, TH, TJ, TK, TL, TM, TN, TO, TR, TT, TV, TW, TZ, UA, UG, UM, US, UY, UZ, VA, VC, VE, VG, VN, VU, WF, WS, XK, YE, YT, ZA, ZM, ZW, ZZ

language

•

Language!

non-null

The language for which the store is customized, ensuring content is tailored to local customers. This includes product descriptions and customer communications that resonate with the target audience.

isoCode

•

LanguageCode!

non-null

The ISO code.

AF, AK, AM, AR, AS, AZ, BE, BG, BM, BN, BO, BR, BS, CA, CE, CKB, CS, CU, CY, DA, DE, DZ, EE, EL, EN, EO, ES, ET, EU, FA, FF, FI, FIL, FO, FR, FY, GA, GD, GL, GU, GV, HA, HE, HI, HR, HU, HY, IA, ID, IG, II, IS, IT, JA, JV, KA, KI, KK, KL, KM, KN, KO, KS, KU, KW, KY, LB, LG, LN, LO, LT, LU, LV, MG, MI, MK, ML, MN, MR, MS, MT, MY, NB, ND, NE, NL, NN, NO, OM, OR, OS, PA, PL, PS, PT, PT_BR, PT_PT, QU, RM, RN, RO, RU, RW, SA, SC, SD, SE, SG, SI, SK, SL, SN, SO, SQ, SR, SU, SV, SW, TA, TE, TG, TH, TI, TK, TO, TR, TT, UG, UK, UR, UZ, VI, VO, WO, XH, YI, YO, ZH, ZH_CN, ZH_TW, ZU

market

•

Market!

non-nullDeprecated

presentmentCurrencyRate

•

Decimal!

non-null

The exchange rate used to convert discounts between the shop's default currency and the currency that displays to the customer during checkout. For example, if a store operates in USD but a customer is viewing discounts in EUR, then the presentment currency rate handles this conversion for accurate pricing.

shop

•

Shop!

non-null

Information about the shop where the Function is running, including the shop's timezone setting and associated metafields.

localTime

•

LocalTime!

non-null

The current time based on the store's timezone setting.

Anchor to datedate • Date! non-null: The current date relative to the parent object.
Anchor to dateTimeAfterdateTimeAfter • Boolean! non-null: Returns true if the current date and time is at or past the given date and time, and false otherwise.
Anchor to dateTimeBeforedateTimeBefore • Boolean! non-null: Returns true if the current date and time is before the given date and time, and false otherwise.
Anchor to dateTimeBetweendateTimeBetween • Boolean! non-null: Returns true if the current date and time is between the two given date and times, and false otherwise.
Anchor to timeAftertimeAfter • Boolean! non-null: Returns true if the current time is at or past the given time, and false otherwise.
Anchor to timeBeforetimeBefore • Boolean! non-null: Returns true if the current time is at or past the given time, and false otherwise.
Anchor to timeBetweentimeBetween • Boolean! non-null: Returns true if the current time is between the two given times, and false otherwise.

metafield

•

Metafield

Anchor to namespacenamespace • String: A category that organizes a group of metafields. Namespaces are used to prevent naming conflicts between different apps or different parts of the same app. If omitted, then the app-reserved namespace is used.
Anchor to keykey • String! required: The unique identifier for the metafield within its namespace. A metafield is composed of a namespace and a key, in the format namespace.key.

Anchor to jsonValuejsonValue • JSON! non-null: The data that's stored in the metafield, using JSON format.
Anchor to typetype • String! non-null: The type of data that the metafield stores in the value field.
Anchor to valuevalue • String! non-null: The data that's stored in the metafield. The data is always stored as a string, regardless of the metafield's type.

Anchor to FunctionFunction

The logic that processes the input data to generate a standardized list of operations that change the pricing and presentation of items in a cart.

Each operation specifies how to display the items in a cart. Shopify processes your response to present the cart items to customers during checkout, including data such as price and quantity.

This return must follow the schema defined in the FunctionRunResult object.

FunctionRunResult

OBJECT

The FunctionRunResult object is the output of the Function run target. The object contains the operations to change the pricing and presentation of items in a cart.

operations

•

[CartOperation!]!

non-null

The ordered list of operations to apply to the cart. For example, you can expand a cart line item to display its bundled items, merge multiple cart lines into a single line representing a bundle, and update the presentation of line items in the cart to override their price, title, or image.

expand

•

ExpandOperation

An operation that expands a single cart line item to form a bundle of components.

cartLineId

•

ID!

non-null

A globally-unique ID for a line item in a cart. A cart line represents a single unit of a product variant that a customer intends to purchase.

expandedCartItems

•

[ExpandedItem!]!

non-null

The cart items to expand. Each item in the list is a component of the bundle. A bundle is a group of products that are sold together as a single unit.

attributes

•

[AttributeOutput!]

The custom attributes associated with a cart line to store additional information. Cart attributes allow you to collect specific information from customers on the Cart page, such as order notes, gift wrapping requests, or custom product details. Attributes are stored as key-value pairs.

Anchor to keykey • String! non-null: The key of the cart line attribute to retrieve. For example, "gift_wrapping".
Anchor to valuevalue • String! non-null: The value of the cart line attribute to retrieve. For example, "true".

merchandiseId

•

ID!

non-null

A globally-unique ID for the product variant that represents the expanded item.

price

•

ExpandedItemPriceAdjustment

A change to the original price of the expanded item. Price adjustments include discounts or additional charges that affect the final price the customer pays. Price adjustments are often used for promotions, special offers, or any price changes that the customer qualifies for.

adjustment

•

ExpandedItemPriceAdjustmentValue!

non-null

The value of the price adjustment to apply to the expanded item.

fixedPricePerUnit

•

ExpandedItemFixedPricePerUnitAdjustment

A fixed price per unit adjustment to apply to the expanded item.

Anchor to amountamount • Decimal! non-null: The fixed price amount per quantity of the expanded item in presentment currency.

quantity

•

Int!

non-null

The quantity of the expanded item. The maximum quantity is 2000.

image

•

ImageInput

The image that replaces the existing image for the group of cart line items. The image must have a publicly accessible URL.

Anchor to urlurl • URL! non-null: The URL of the image.

price

•

PriceAdjustment

A change to the original price of a group of items. Price adjustments include discounts or additional charges that affect the final price the customer pays. Price adjustments are often used for promotions, special offers, or any price changes that the customer qualifies for.

percentageDecrease

•

PriceAdjustmentValue

The percentage price decrease of the price adjustment.

Anchor to valuevalue • Decimal! non-null: The value of the price adjustment.

title

•

String

The title that replaces the existing title for the cart line item. If you don't provide a title, then the title of the product variant is used.

merge

•

MergeOperation

An operation that merges multiple cart line items into a single line, representing a bundle of components.

attributes

•

[AttributeOutput!]

Anchor to keykey • String! non-null: The key of the cart line attribute to retrieve. For example, "gift_wrapping".
Anchor to valuevalue • String! non-null: The value of the cart line attribute to retrieve. For example, "true".

cartLines

•

[CartLineInput!]!

non-null

The cart items to merge. Each item in the list is a component of the bundle.

Anchor to cartLineIdcartLineId • ID! non-null: A globally-unique ID for a line item in a cart. A cart line represents a single unit of a product variant that a customer intends to purchase.
Anchor to quantityquantity • Int! non-null: The quantity of the cart line to be merged.The max quantity is 2000.

image

•

ImageInput

The image that replaces the existing image for the group of cart line items. The image must have a publicly accessible URL.

Anchor to urlurl • URL! non-null: The URL of the image.

parentVariantId

•

ID!

non-null

The globally-unique ID of the product variant that represents the collection of cart line items.

price

•

PriceAdjustment

percentageDecrease

•

PriceAdjustmentValue

The percentage price decrease of the price adjustment.

Anchor to valuevalue • Decimal! non-null: The value of the price adjustment.

title

•

String

The title that replaces the existing title for a group of cart line items. If you don't provide a title, then the title of the parent variant is used.

update

•

UpdateOperation

An operation that allows you to override the price, title, and image of a cart line item. Only stores on a Shopify Plus plan can use apps with update operations.

cartLineId

•

ID!

non-null

A globally-unique ID for a line item in a cart. A cart line represents a single unit of a product variant that a customer intends to purchase.

image

•

ImageInput

The image that replaces the existing image for the cart line item. The image must have a publicly accessible URL.

Anchor to urlurl • URL! non-null: The URL of the image.

price

•

UpdateOperationPriceAdjustment

A change to an item's original price. Price adjustments include discounts or additional charges that affect the final price the customer pays. Price adjustments are often used for promotions, special offers, or any price changes for which the customer qualifies.

adjustment

•

UpdateOperationPriceAdjustmentValue!

non-null

The price adjustment per unit to apply to the cart line item.

fixedPricePerUnit

•

UpdateOperationFixedPricePerUnitAdjustment

A fixed price per unit adjustment to apply to a cart line.

Anchor to amountamount • Decimal! non-null: The fixed price amount per quantity of the cart line item in presentment currency.

title

•

String

The title that replaces the existing title for the cart line item. If you don't provide a title, then the title of the product variant is used.

Examples

Add gift wrapping to cart items
Create a cart bundle with an add-on
Expand a product bundle into component items
Provide special pricing and labels for VIP customers
Apply a discount on bulk quantity purchases
Apply custom images and personalized titles to products
Create a wholesale-only SKU bundling discount
Create a beauty routine product bundle
Create a combo meal bundle

Input query

query Input {

presentmentCurrencyRate

cart {

lines {

quantity

cost {

amountPerQuantity {

amount

currencyCode

}

# Access the cart line attribute to decide if we should add a warranty

giftWrapAdded: attribute(key: "Gift Wrap Added") {

value

}

merchandise {

__typename

... on ProductVariant {

title

product {

# Access the metafield value to determine the cost of the gift wrap

giftWrapCost: metafield(namespace: "$app:gift-wrap", key: "cost") {

type

jsonValue

}

cartTransform {

# Access the variant ID that represents the warranty product

giftWrapVariantID: metafield(namespace: "$app:optional-add-ons", key: "function-configuration") {

value

}

Input object (response)

JSON

{

"presentmentCurrencyRate": "1.0",

"cart": {

"lines": [

{

"id": "gid://shopify/CartLine/1",

"quantity": 1,

"cost": {

"amountPerQuantity": {

"amount": "100.0",

"currencyCode": "CAD"

}

"giftWrapAdded": {

"value": "No"

"merchandise": {

"__typename": "ProductVariant",

"id": "gid://shopify/ProductVariant/1099",

"title": "Something that is not wrapped",

"product": {

"giftWrapCost": {

"type": "money",

"jsonValue": {

"amount": "5.00",

"currencyCode": "CAD"

}

{

"id": "gid://shopify/CartLine/2",

"quantity": 5,

"cost": {

"amountPerQuantity": {

"amount": "100.0",

"currencyCode": "CAD"

}

"giftWrapAdded": {

"value": "Yes"

"merchandise": {

"__typename": "ProductVariant",

"id": "gid://shopify/ProductVariant/456",

"title": "Something that is wrapped",

"product": {

"giftWrapCost": {

"type": "money",

"jsonValue": {

"amount": "5.00",

"currencyCode": "CAD"

}

]

"cartTransform": {

"giftWrapVariantID": {

"value": "gid://shopify/ProductVariant/2"

}

Function code

use crate::schema;

use shopify_function::prelude::*;

use shopify_function::Result;

#[derive(Debug, Deserialize)]

#[shopify_function(rename_all = "camelCase")]

pub struct Money {

pub amount: String,

pub currency_code: String,

}

#[shopify_function]

fn run(input: schema::run::Input) -> Result<schema::FunctionRunResult> {

let presentment_currency_rate_f64 = input.presentment_currency_rate().0;

let cart_operations: Vec<schema::CartOperation> = get_update_cart_operations(

&input.cart(),

&input.cart_transform(),

presentment_currency_rate_f64,

);

Ok(schema::FunctionRunResult {

operations: cart_operations,

})

}

fn get_update_cart_operations(

cart: &schema::run::input::Cart,

cart_transform: &schema::run::input::CartTransform,

presentment_currency_rate: f64,

) -> Vec<schema::CartOperation> {

cart.lines()

.iter()

.filter_map(|line| {

let gift_wrap_added = get_gift_wrap_added(line);

let gift_wrap_cost = get_gift_wrap_cost(line);

let gift_wrap_variant_id = &cart_transform.gift_wrap_variant_id();

if let (schema::run::input::cart::lines::Merchandise::ProductVariant(variant), Some(_gift_wrap_variant_id)) =

(&line.merchandise(), gift_wrap_variant_id)

{

if gift_wrap_added && gift_wrap_cost > 0.0 {

let original_item = schema::ExpandedItem {

merchandise_id: variant.id().clone(),

quantity: 1,

price: Some(schema::ExpandedItemPriceAdjustment {

adjustment: schema::ExpandedItemPriceAdjustmentValue::FixedPricePerUnit(

schema::ExpandedItemFixedPricePerUnitAdjustment {

amount: Decimal(line.cost().amount_per_quantity().amount().0),

}),

attributes: None,

};

let expanded_cart_item = schema::ExpandedItem {

merchandise_id: _gift_wrap_variant_id.value().clone(),

quantity: 1,

price: Some(schema::ExpandedItemPriceAdjustment {

adjustment: schema::ExpandedItemPriceAdjustmentValue::FixedPricePerUnit(

schema::ExpandedItemFixedPricePerUnitAdjustment {

amount: Decimal(

gift_wrap_cost

* presentment_currency_rate,

}),

attributes: None,

};

let expand_operation = schema::ExpandOperation {

cart_line_id: line.id().clone(),

title: variant.title().to_owned().cloned(),

image: None,

price: None,

expanded_cart_items: vec![original_item, expanded_cart_item],

};

Some(schema::CartOperation::Expand(expand_operation))

} else {

None

}

} else {

None

}

})

.collect()

}

fn get_gift_wrap_added(line: &schema::run::input::cart::Lines) -> bool {

match &line.gift_wrap_added() {

Some(input_cart_lines_gift_wrap_added) => match &input_cart_lines_gift_wrap_added.value() {

Some(text) => text.as_str() == "Yes",

None => false,

}

fn get_gift_wrap_cost(line: &schema::run::input::cart::Lines) -> f64 {

match &line.merchandise() {

schema::run::input::cart::lines::Merchandise::ProductVariant(variant) => {

if let Some(gift_wrap_cost) = variant.product().gift_wrap_cost() {

let money = gift_wrap_cost.json_value();

money.amount.parse::<f64>().unwrap_or(5.00)

} else {

5.00

}

_ => 5.00,

}

use crate::schema;
use shopify_function::prelude::*;
use shopify_function::Result;


#[derive(Debug, Deserialize)]
#[shopify_function(rename_all = "camelCase")]

pub struct Money {
  pub amount: String,
  pub currency_code: String,
}

#[shopify_function]
fn run(input: schema::run::Input) -> Result<schema::FunctionRunResult> {
    let presentment_currency_rate_f64 = input.presentment_currency_rate().0;
    let cart_operations: Vec<schema::CartOperation> = get_update_cart_operations(
        &input.cart(),
        &input.cart_transform(),
        presentment_currency_rate_f64,
    );

    Ok(schema::FunctionRunResult {
        operations: cart_operations,
    })
}

fn get_update_cart_operations(
    cart: &schema::run::input::Cart,
    cart_transform: &schema::run::input::CartTransform,
    presentment_currency_rate: f64,
) -> Vec<schema::CartOperation> {
    cart.lines()
        .iter()
        .filter_map(|line| {
            let gift_wrap_added = get_gift_wrap_added(line);
            let gift_wrap_cost = get_gift_wrap_cost(line);
            let gift_wrap_variant_id = &cart_transform.gift_wrap_variant_id();
            if let (schema::run::input::cart::lines::Merchandise::ProductVariant(variant), Some(_gift_wrap_variant_id)) =
                (&line.merchandise(), gift_wrap_variant_id)
            {
                if gift_wrap_added && gift_wrap_cost > 0.0 {
                    let original_item = schema::ExpandedItem {
                        merchandise_id: variant.id().clone(),
                        quantity: 1,
                        price: Some(schema::ExpandedItemPriceAdjustment {
                            adjustment: schema::ExpandedItemPriceAdjustmentValue::FixedPricePerUnit(
                                schema::ExpandedItemFixedPricePerUnitAdjustment {
                                    amount: Decimal(line.cost().amount_per_quantity().amount().0),
                                },
                            ),
                        }),
                        attributes: None,
                    };
                    let expanded_cart_item = schema::ExpandedItem {
                        merchandise_id: _gift_wrap_variant_id.value().clone(),
                        quantity: 1,
                        price: Some(schema::ExpandedItemPriceAdjustment {
                            adjustment: schema::ExpandedItemPriceAdjustmentValue::FixedPricePerUnit(
                                schema::ExpandedItemFixedPricePerUnitAdjustment {
                                    amount: Decimal(
                                            gift_wrap_cost
                                            * presentment_currency_rate,
                                    ),
                                },
                            ),
                        }),
                        attributes: None,
                    };
                    let expand_operation = schema::ExpandOperation {
                        cart_line_id: line.id().clone(),
                        title: variant.title().to_owned().cloned(),
                        image: None,
                        price: None,
                        expanded_cart_items: vec![original_item, expanded_cart_item],
                    };
                    Some(schema::CartOperation::Expand(expand_operation))
                } else {
                    None
                }
            } else {
                None
            }
        })
        .collect()
}

fn get_gift_wrap_added(line: &schema::run::input::cart::Lines) -> bool {
    match &line.gift_wrap_added() {
        Some(input_cart_lines_gift_wrap_added) => match &input_cart_lines_gift_wrap_added.value() {
            Some(text) => text.as_str() == "Yes",
            None => false,
        },
        None => false,
    }
}

fn get_gift_wrap_cost(line: &schema::run::input::cart::Lines) -> f64 {
    match &line.merchandise() {
        schema::run::input::cart::lines::Merchandise::ProductVariant(variant) => {
            if let Some(gift_wrap_cost) = variant.product().gift_wrap_cost() {
                let money = gift_wrap_cost.json_value();
                money.amount.parse::<f64>().unwrap_or(5.00)
            } else {
                5.00
            }
        },
        _ => 5.00,
    }
}

use crate::schema;
use shopify_function::prelude::*;
use shopify_function::Result;


#[derive(Debug, Deserialize)]
#[shopify_function(rename_all = "camelCase")]

pub struct Money {
  pub amount: String,
  pub currency_code: String,
}

#[shopify_function]
fn run(input: schema::run::Input) -> Result<schema::FunctionRunResult> {
    let presentment_currency_rate_f64 = input.presentment_currency_rate().0;
    let cart_operations: Vec<schema::CartOperation> = get_update_cart_operations(
        &input.cart(),
        &input.cart_transform(),
        presentment_currency_rate_f64,
    );

    Ok(schema::FunctionRunResult {
        operations: cart_operations,
    })
}

fn get_update_cart_operations(
    cart: &schema::run::input::Cart,
    cart_transform: &schema::run::input::CartTransform,
    presentment_currency_rate: f64,
) -> Vec<schema::CartOperation> {
    cart.lines()
        .iter()
        .filter_map(|line| {
            let gift_wrap_added = get_gift_wrap_added(line);
            let gift_wrap_cost = get_gift_wrap_cost(line);
            let gift_wrap_variant_id = &cart_transform.gift_wrap_variant_id();
            if let (schema::run::input::cart::lines::Merchandise::ProductVariant(variant), Some(_gift_wrap_variant_id)) =
                (&line.merchandise(), gift_wrap_variant_id)
            {
                if gift_wrap_added && gift_wrap_cost > 0.0 {
                    let original_item = schema::ExpandedItem {
                        merchandise_id: variant.id().clone(),
                        quantity: 1,
                        price: Some(schema::ExpandedItemPriceAdjustment {
                            adjustment: schema::ExpandedItemPriceAdjustmentValue::FixedPricePerUnit(
                                schema::ExpandedItemFixedPricePerUnitAdjustment {
                                    amount: Decimal(line.cost().amount_per_quantity().amount().0),
                                },
                            ),
                        }),
                        attributes: None,
                    };
                    let expanded_cart_item = schema::ExpandedItem {
                        merchandise_id: _gift_wrap_variant_id.value().clone(),
                        quantity: 1,
                        price: Some(schema::ExpandedItemPriceAdjustment {
                            adjustment: schema::ExpandedItemPriceAdjustmentValue::FixedPricePerUnit(
                                schema::ExpandedItemFixedPricePerUnitAdjustment {
                                    amount: Decimal(
                                            gift_wrap_cost
                                            * presentment_currency_rate,
                                    ),
                                },
                            ),
                        }),
                        attributes: None,
                    };
                    let expand_operation = schema::ExpandOperation {
                        cart_line_id: line.id().clone(),
                        title: variant.title().to_owned().cloned(),
                        image: None,
                        price: None,
                        expanded_cart_items: vec![original_item, expanded_cart_item],
                    };
                    Some(schema::CartOperation::Expand(expand_operation))
                } else {
                    None
                }
            } else {
                None
            }
        })
        .collect()
}

fn get_gift_wrap_added(line: &schema::run::input::cart::Lines) -> bool {
    match &line.gift_wrap_added() {
        Some(input_cart_lines_gift_wrap_added) => match &input_cart_lines_gift_wrap_added.value() {
            Some(text) => text.as_str() == "Yes",
            None => false,
        },
        None => false,
    }
}

fn get_gift_wrap_cost(line: &schema::run::input::cart::Lines) -> f64 {
    match &line.merchandise() {
        schema::run::input::cart::lines::Merchandise::ProductVariant(variant) => {
            if let Some(gift_wrap_cost) = variant.product().gift_wrap_cost() {
                let money = gift_wrap_cost.json_value();
                money.amount.parse::<f64>().unwrap_or(5.00)
            } else {
                5.00
            }
        },
        _ => 5.00,
    }
}

Function run result

JSON

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Anchor to Multiple operationsMultiple operations

Sometimes, a Function might return multiple expand, merge, and update operations for the same cart line, which can lead to collisions. For example, a collision might happen when you execute different operations in quick succession, or when multiple changes are applied to the same cart line. To avoid potential issues, try to minimize these collisions in your implementation.

If a collision does occur, then Shopify handles it by executing a subset of operations based on the following criteria:

If multiple expand operations target the same cart line, then the first expand operation in the list is executed, and all other expand operations for the same cart line are discarded.
If multiple merge operations target the same cart line, then the first merge operation in the list is executed, and all other merge operations for the same cart line are discarded.
If both expand and merge operations target the same cart line, then the expand operation is executed, and the merge operation is discarded.
If multiple update operations target the same cart line, then the first update operation in the list is executed, and all other update operations for the same cart line are discarded.
If expand, merge, and update operations target the same cart line, then the expand operation is executed while the merge and update operations are discarded.
If both fixed expand and customized expand operations target the same cart line, then the fixed expand operation is executed and the customized expand operation is discarded.

Was this section helpful?

Anchor to Pricing adjustmentsPricing adjustments

You can use merge and expand operations to adjust pricing. The bundle base price varies depending on the operation:

merge: The adjustment is based on the components' price sum.
expand: The adjustment is based on the bundle product price.

This distinction ensures that the correct price appears for expand operations on the Product details page and in Liquid.

For example, to arrive at the final bundle price, you can use the following post-processing operations:

merge: The final price is the sum of the individual component prices, plus the adjustment, if present.
expand: The final price is the sum of the individual component fixedPricePerUnit values, or the bundle product price, plus the adjustment, if present.

Anchor to Component pricingComponent pricing

Expand operations allow you to adjust the price of each individual component in the bundle by providing a price on the expandedCartItems field in the ExpandOperation object.

The costs returned by the input query reflect prices in the presentment currency, and all operation outputs are also processed in this currency. Presentment currency is the currency that customers see when they view prices in a store.

If you need to set a new price based on the cost in the store's currency, then you should do the following:

To get the conversion rate from shop currency to presentment currency, include the presentmentCurrencyRate field in your input query.
Convert the amount from the shop currency to presentment currency using the rate.
Return the converted price in your operation output.

Anchor to Weight price algorithmWeight price algorithm

When you don't provide a fixed price per unit on expand operations, Shopify allocates the bundle price to its component lines based on the weight of each component line. The weight of a component is calculated as the unit price multiplied by quantity, as unit price * quantity.

The algorithm considers the item's price as if the item was bought individually and the quantity inside the bundle. For example, if a bundle has 10 t-shirts and 1 pair of shorts, and the shorts and t-shirt cost $5 if they were bought individually, then Shopify allocates more weight to the t-shirt. The total weight of all component lines is then used to calculate the weight of each component line.

Anchor to ExampleExample

Amount to be allocated: $100

Component lines:

unit_price: $10, quantity: 1, id: 1 # weight 10
unit_price: $20, quantity: 2, id: 2 # weight 40
unit_price: $30, quantity: 3, id: 3 # weight 90

Total weight: 140

Result:

Component 1: $7.14 -> (10 / 140) * $100 = 7.14
Component 2: $28.57 -> (40 / 140) * $100 = 28.57
Component 3: $64.29 -> (90 / 140) * $100 = 64.29

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Anchor to Overriding images and titlesOverriding images and titles

Uploading images: For optimal performance and security, you can only use upload images for cart lines from Shopify CDN. You can upload images through the Shopify admin or using the GraphQL Admin API. Using images from outside of the CDN will result in an invalid_image_url error.
Image sizes: Image URLs shouldn't include a size suffix. The cart will automatically request the appropriately sized image from the CDN by adding a size suffix to the image name, such as custom-image_64x64.png.
Showing overrides: Title and image overrides appear across various surfaces, including the cart, checkout, and order notification emails. To see title overrides applied by Cart Transform Functions in these areas, you'll need to modify your themes. Use item.title for the cart and line.title for order notification emails to display the updated titles.

Was this section helpful?

Anchor to ErrorsErrors

The following errors can occur when using the Cart Transform API:

Errors that can occur when using the Cart Transform API
Operation type	Error code	Message
`expand`	`cannot_combine_price_adjustment_and_price_per_component`	Cannot combine both an overall price adjustment and individual prices for components.
	`component_merchandise_not_found`	One or more of the expanded cart items have a merchandise ID that does not exist.
	`exceeded_maximum_number_of_supported_expanded_cart_items`	Exceeded the maximum number of supported expanded cart items (150).
	`expanded_items_missing_prices`	One or more expanded cart items are missing prices. Either all must have a price, or none.
	`image_feature_not_available`	The feature to update the image is not accessible for the given shop.
	`image_not_found`	Image not found for the shop.
	`invalid_cart_line_id`	The cart line ID is invalid.
	`invalid_component_merchandise_id`	One or more of the expanded cart items have an invalid merchandise ID.
	`invalid_component_quantity`	One or more of the expanded cart items have an invalid quantity.
	`invalid_component_price`	One or more of the expanded cart items have an invalid price.
	`invalid_image_url`	The base image URL must be any of the following: https://cdn.shopify.com, https://cdn.shopifycdn.net, or the shop's domain with a path of /cdn/*.
	`invalid_price_adjustment_percentage_decrease`	The percentage decrease value must be less than or equal to 100.
	`price_per_component_feature_not_available`	The feature to price an expanded cart item is not accessible for the given shop.
	`title_feature_not_available`	The feature to update the title is not accessible for the given shop.
`merge`	`exceeded_maximum_number_of_supported_merged_cart_items`	Exceeded the maximum number of supported merged cart items.
	`image_not_found`	Image not found for the shop.
	`insufficient_component_quantity_to_merge`	There are not enough items in the cart to satisfy one or more of the component quantities.
	`invalid_component_cart_line_id`	One or more of the cart lines have an invalid cart line ID.
	`invalid_component_quantity`	One or more of the cart lines have an invalid quantity.
	`invalid_image_url`	The base image URL must be any of the following: https://cdn.shopify.com, https://cdn.shopifycdn.net, or the shop's domain with a path of /cdn/*.
	`invalid_parent_variant_id`	The parent variant ID isn't valid.
	`invalid_price_adjustment_percentage_decrease`	The percentage decrease value must be less than or equal to 100.
	`parent_variant_not_found`	The parent variant doesn't exist.
`update`	`fixed_price_adjustment_cannot_be_negative`	Fixed price adjustments cannot be negative.
	`image_not_found`	Image not found for the shop.
	`invalid_cart_line_id`	The cart line ID is invalid.
	`invalid_image_url`	The base image URL must be any of the following: https://cdn.shopify.com, https://cdn.shopifycdn.net, or the shop's domain with a path of /cdn/*.
	`update_feature_not_available`	The update operation feature is not accessible for the given shop.

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Anchor to Invalid scenariosInvalid scenarios

Shopify rejects expand, merge, and update operations if a selling plan is present. Rejections are different from error scenarios, which might involve implementation issues not directly related to the operations being performed.

The following table describes invalid scenarios by operation type:

Invalid scenarios by operation type
Operation type	Scenarios
`expand`	One of the component quantities is less than 0. The line to be expanded doesn't exist. One of the component variant IDs doesn't exist. Both `ExpandedItem.Price` and `PriceAdjustment` are returned in the operation. One of the components is given a price less than 0. Some of the components have a customized price and others don't.
`merge`	The merge operation contains an invalid quantity for the children (less than 0 or the quantity to merge is bigger than the line's quantity). The parent variant ID doesn't exist. One of the lines to be merged doesn't exist.
`update`	The operation includes a price < 0. The line to be updated doesn't exist. The operation targets a line that is going to be expanded or merged. The shop is not on a Plus plan or a Development store plan.

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