{
 "computed": {
  "items_value": 72.05,
  "tax_plus_shipping": 9.59,
  "total": 81.64
 },
 "event": "purchase",
 "event_parameters": [
  {
   "name": "value",
   "note": "Sum of (price * quantity) for all items. Do not include shipping or tax.",
   "required": true,
   "type": "number"
  },
  {
   "name": "tax",
   "note": "Tax amount for the transaction, separate from value.",
   "required": false,
   "type": "number"
  },
  {
   "name": "shipping",
   "note": "Shipping amount for the transaction, separate from value.",
   "required": false,
   "type": "number"
  },
  {
   "name": "currency",
   "note": "3-letter ISO 4217 code. Required if value is set.",
   "required": true,
   "type": "string"
  },
  {
   "name": "transaction_id",
   "note": "Unique identifier of the transaction.",
   "required": true,
   "type": "string"
  },
  {
   "name": "items",
   "note": "Array of purchased items.",
   "required": true,
   "type": "array"
  }
 ],
 "page_numbers": [
  "10.01",
  "21.01",
  "30.03",
  "42.02",
  "72.05",
  "3.60",
  "5.99",
  "81.64",
  "9.59"
 ],
 "verified_example": {
  "currency": "USD",
  "items": [
   {
    "item_brand": "Google",
    "item_category": "Apparel",
    "item_id": "SKU_12345",
    "item_name": "Stan and Friends Tee",
    "price": 10.01,
    "quantity": 3
   },
   {
    "item_brand": "Google",
    "item_category": "Apparel",
    "item_id": "SKU_12346",
    "item_name": "Google Grey Women's Tee",
    "price": 21.01,
    "quantity": 2
   }
  ],
  "shipping": 5.99,
  "tax": 3.6,
  "total": 81.64,
  "transaction_id": "T_12345",
  "value": 72.05
 }
}