`cart` Add to cart

A product in a size was added to the cart.

When to send it

Merchant tag fmttag or the Shopify pixel, on add to cart.

Sent only after the shopper gave analytics consent; dropped, never queued, before it.
Kept 25 months.
Send tracking_id when you have it: without one the event is kept but marked untracked.

Required fields

Field	Type	Rules
`client_id`	`integer`	greater than 0
`event`	`"cart"`
`timestamp_ms`	`integer`
`product_id`	`string`	1–255 characters
`size`	`string \| null`	1–64 characters; may be null

Optional fields

Field	Type	Rules
`tracking_id`	`string`	a UUID
`event_id`	`string`	1–255 characters
`schema_version`	`1`
`user_agent`	`string`	at most 2048 characters
`shop_country`	`string \| null`	at most 8 characters; may be null
`channel`	`string \| null`	at most 64 characters; may be null
`instance_id`	`string`	1–255 characters
`brand_id`	`integer \| null`	greater than 0; may be null
`product_associated`	`boolean`
`ab_data`	`object`
`testEvent`	`true`
`extra`	`object`
`variant_id`	`string`	1–64 characters
`quantity`	`integer`	greater than 0
`price`	`number`	0 or more
`currency`	`string`	3 capital letters (ISO 4217)
`platform_product_id`	`string`	1–255 characters

Example

Test values only. This example passes the event's schema.

{
  "event": "cart",
  "client_id": 1000,
  "tracking_id": "3f0b8c2e-4d5a-4b6c-8d7e-9f0a1b2c3d4e",
  "timestamp_ms": 1792000000000,
  "product_id": "TEST-JACKET-01",
  "size": "M",
  "quantity": 1,
  "price": 59.9,
  "currency": "EUR"
}

Checks and messages

What Tracking debug in your back office checks for this event, with its exact message. An error means the event is not counted; a warning means it is counted but something is likely wrong; an info is a hint.

Level	Check	Message
error	`body_data`	the field: body data is not allowed here, the value was dropped (D110)
error	`invalid_field`	what is wrong with the field
error	`over_limit`	the field is over the limit of <limit>
error	`product_id_missing`	missing product_id
warning	`currency_not_iso`	the field "<value>" is not an ISO 4217 currency code (3 letters, such as EUR)
warning	`price_text`	the field was sent as text: send a number (stored as <value>)
warning	`product_unknown`	product not found in your catalogue or has no size chart
warning	`size_not_in_product`	size "<value>" is not one of the product's sizes
warning	`timestamp_missing`	timestamp_ms is missing or not a time in milliseconds: the time the event was received is used
warning	`timestamp_out_of_range`	timestamp_ms is more than 30 days old or more than 3 days ahead: the time the event was received is used
warning	`untracked`	untracked: no tracking_id. The event is kept but cannot be joined to the widget visitor.
info	`size_lower_case`	size "<value>" was sent in lower case. Use uppercase letters or numbers.

JSON schema

The schema the API checks this event against: cart.schema.json.

cart Add to cart