> For the complete documentation index, see [llms.txt](https://developers.airship.co.uk/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developers.airship.co.uk/basics/contacts/append-purchase-history.md).

# Append purchase history

### Overview

Airship can store full purchase history for contact records.

This is useful to measure customer value and target recent or lapsed visitors based on their purchase history.

### Storing purchase history

To store purchase history, simply append a `purchases` object to your contact as you send it to us.

| Field           | Notes                                                                                                                                                                                                                     |
| --------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| provider\_id    | This is the partners ID to help identify the source of a purchase. If you need one creating, please contact <support@airship.co.uk>, we'll get one added and provide you an ID                                            |
| order\_type\_id | <p>The order type relating to how the purchase was made;</p><p></p><p>1 = Unknown </p><p>2 = Pay at table </p><p>3 = Click and Collect </p><p>4 = Dine in </p><p>5 = Delivery </p><p>6 = Online Shop </p><p>7 = Other</p> |

```javascript
"account_id": 3,
"email: "johnsmith@gmail.com",
//...etc...

"purchases": [
    {
      "transaction_reference": "77FF-24FF-234F-77FF",
      "unit_id": 8775,
      "created_at": "2021-06-01 00:00:00",
      "provider_id": 1,
      "order_type_id": 4,
      "items": [
        {
          "description": "Negroni",
          "sku": "abc_8913", // string SKU for this product
          "quantity": 1, // qty of this item
          "value": 7 // total value (quantity x item value) in decimal
        },
        {
          "description": "Garlic Bread",
          "sku": "5621",
          "quantity": 2,
          "value": 8.40
        }
      ]
    }
]
```


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