cart_updated

After every price update.

CODE

next.analytics.on('cart_updated', (event) => {});

Triggered by cart.calculated.

Data

Present: always; optional when it may be missing; campaign once the campaign is loaded; priced once the server priced the cart.

Field	Type	Present
`lines`	`CartItem[]`	always	Every line in the cart, the same package's lines merged.
`coupons`	`string[]`	always	The codes the shopper applied, uppercase. A bundle card's own codes are not listed.
`currency`	`string`	campaign	ISO 4217, such as `USD`.
`shipping_method`	`ShippingMethod`	optional	The selected shipping method, and what shipping costs.
`subtotal`	`number`	priced	The products before discounts, without shipping.
`total_discount`	`number`	priced	The discounts on the products, without shipping's: the sum of `discounts`.
`total`	`number`	priced	What the shopper pays.
`discounts`	`Discount[]`	priced	The discounts on the products, one per offer.
`discount_percentage`	`number`	priced	`total_discount ÷ subtotal × 100`, to two decimals; `0` without a discount.
`quantity`	`number`	always	Units in the cart: each line's quantity.

CartItem

A line of the cart. Its prices are there once the server priced the cart.

Field	Type	Present
`package_id`	`number`	always	The package's `ref_id` in the campaign.
`quantity`	`number`	always	Package quantity.
`is_upsell`	`boolean`	optional	`true` for a line added after the order.
`properties`	`Record<string, string>`	optional	Line properties, such as a variant picked in a bundle slot.
`product_id`	`number`	campaign	The product in the store.
`product_title`	`string`	campaign	The product's name as customers see it, as on an order line; the package's name for a package without one.
`variant_id`	`number`	campaign	The product variant, for a product with variants.
`variant_title`	`string`	campaign	The variant's name, such as `Black / M`, for a product with variants.
`sku`	`string`	campaign	The product's Stock Keeping Unit.
`image`	`string`	campaign	The package's image URL.
`price`	`number`	priced	What one package costs after discounts.
`original_price`	`number`	priced	What one package costs before discounts; equal to `price` when nothing is taken off.
`total_discount`	`number`	priced	The discount on the line.
`total`	`number`	priced	`price × quantity`.
`subtotal`	`number`	priced	The line before discounts: `total = subtotal − total_discount`.
`discount_percentage`	`number`	priced	`total_discount ÷ subtotal × 100`, to two decimals; `0` without a discount.
`discounts`	`Discount[]`	priced	The discounts on the line.
`subscription`	`Subscription`	campaign	For a package billed again every interval.

ShippingMethod

The selected shipping method, and what shipping costs.

Field	Type	Present
`id`	`number`	always	The method's `ref_id`.
`code`	`string`	campaign	Such as `standard`.
`name`	`string`	priced	The method's name.
`price`	`number`	priced	What shipping costs after discounts; `0` is free shipping.
`original_price`	`number`	priced	What shipping costs before discounts.
`discounts`	`Discount[]`	priced	The discounts on shipping, such as a free-shipping offer.

Discount

A discount on the cart's products or on its shipping. Amounts are in the cart's currency.

Field	Type	Present
`name`	`string`	always	The offer's name.
`amount`	`number`	always	The amount taken off.
`source`	`"offer"` \| `"coupon"`	always	`coupon` for a code the shopper entered (it is in `coupons`); `offer` for an automatic offer or a bundle card's own code.
`code`	`string`	optional	The code, for a coupon.
`offer_id`	`number`	always	The offer that gave it.
`percentage`	`number`	optional	The percentage the offer is set to take off, as the API reports it, such as `20`. Its configured value, for a label such as “20% off”; the amount actually taken off is `amount`.

Subscription

A package billed again every interval.

Field	Type	Present
`interval`	`"day"` \| `"month"`	always	The unit of the renewal interval.
`interval_count`	`number`	always	How many `interval`s between renewals.
`price`	`number`	priced	What each renewal charges, after discounts.
`original_price`	`number`	priced	What each renewal charges before discounts.

Example

The envelope next.analytics.on hands out, with data inside. See How analytics works for its fields.

CODE

{
  "event_id": "3f2b8c1d9e7a4b6c8d5e2f1a0b9c8d7e",
  "event_type": "cart_updated",
  "object": "cart",
  "data": {
    "lines": [
      {
        "package_id": 1,
        "quantity": 1,
        "product_id": 400,
        "product_title": "Earbuds ×1",
        "image": "https://cdn.test/1.png",
        "price": 49,
        "original_price": 99,
        "total_discount": 0,
        "total": 49,
        "subtotal": 49,
        "discount_percentage": 0,
        "discounts": []
      }
    ],
    "coupons": [],
    "quantity": 1,
    "currency": "USD",
    "shipping_method": {
      "id": 1,
      "code": "standard",
      "name": "Standard",
      "price": 0,
      "original_price": 0,
      "discounts": []
    },
    "subtotal": 49,
    "total_discount": 0,
    "total": 49,
    "discounts": [],
    "discount_percentage": 0
  },
  "created_at": "2026-11-04T08:30:00.000Z",
  "session_id": "0b8f3c2d1e4a4f6b9c7d5e3f2a1b0c9d",
  "sdk_version": "0.5.0",
  "context": {
    "page_location": "https://shop.test/checkout/",
    "page_title": "Olympus Earbuds",
    "page_referrer": "",
    "campaign": {
      "id": 1310,
      "name": "Olympus",
      "currency": "USD",
      "language": "en"
    },
    "session_id": "0b8f3c2d1e4a4f6b9c7d5e3f2a1b0c9d",
    "attribution": {
      "funnel": "Olympus"
    },
    "browser": {
      "user_agent": "Mozilla/5.0 …",
      "language": "en-US",
      "device_type": "desktop"
    }
  }
}

Sent to

Destination	As
GTM	`dl_cart_updated`
GA4	`update_cart`
Meta pixel	Not sent
RudderStack	`Cart Viewed`