Shopify Storefront Cart Structure

{
  "title": "Shopify Storefront Cart Structure",
  "description": "Hierarchical structure of the Shopify Storefront API Cart object",
  "resource": "Cart",
  "graphqlType": "Cart",
  "mutation": "cartCreate",
  "structure": {
    "id": { "type": "string", "description": "Cart GID (gid://shopify/Cart/{token})" },
    "checkoutUrl": { "type": "uri", "description": "URL to Shopify-hosted checkout" },
    "totalQuantity": { "type": "integer", "description": "Total item count across all lines" },
    "createdAt": { "type": "datetime", "description": "Cart creation timestamp" },
    "updatedAt": { "type": "datetime", "description": "Last modification timestamp" },
    "note": { "type": "string", "nullable": true, "description": "Buyer note for the order" },
    "cost": {
      "type": "object",
      "description": "Pricing summary for the cart",
      "properties": {
        "totalAmount": { "type": "MoneyV2", "description": "Grand total including taxes" },
        "subtotalAmount": { "type": "MoneyV2", "description": "Total before taxes and shipping" },
        "totalTaxAmount": { "type": "MoneyV2", "nullable": true, "description": "Total tax" },
        "totalDutyAmount": { "type": "MoneyV2", "nullable": true, "description": "Total duty/import fees" }
      }
    },
    "lines": {
      "type": "Connection<CartLine>",
      "description": "Paginated list of cart line items",
      "items": {
        "id": { "type": "string", "description": "Cart line GID" },
        "quantity": { "type": "integer", "description": "Quantity of the variant" },
        "merchandise": {
          "type": "ProductVariant",
          "description": "The product variant being purchased"
        },
        "cost": {
          "type": "object",
          "properties": {
            "totalAmount": { "type": "MoneyV2" },
            "amountPerQuantity": { "type": "MoneyV2" }
          }
        },
        "attributes": {
          "type": "array",
          "description": "Custom attributes for the line item",
          "items": {
            "key": { "type": "string" },
            "value": { "type": "string" }
          }
        }
      }
    },
    "discountCodes": {
      "type": "array",
      "description": "Applied discount codes",
      "items": {
        "code": { "type": "string" },
        "applicable": { "type": "boolean" }
      }
    },
    "attributes": {
      "type": "array",
      "description": "Custom cart attributes",
      "items": {
        "key": { "type": "string" },
        "value": { "type": "string" }
      }
    }
  }
}