> For the complete documentation index, see [llms.txt](https://docs.ingestlabs.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ingestlabs.com/implementation/s2s/tracking-events/purchase.md).

# Purchase

When user initiates checkout, fire the below event.

**Event Name**

mp\_purchase

**Event Payload**

```
{
    event: {
      currency: 'INR', /* Currency of website */
      transaction_id: '<order id>', /* Order Id of transaction */
      cart_id: '<unique cart id>', // mandatory
      value: 123.33, // float value of order
      coupon: '<optional coupon>', // Leave this undefined if there is no coupon
      shipping: 123.33, // total shipping value in float
      tax: 123.33, // total tax value in float
      tracking_url: '', // url for tracking the order status
      payment_type: 'Credit Card', // optional
      items: [/* Refer to Products Array page in reference below */],
      ev_source: '<Orign of the event>' // Example: Razorpay, Gokwik, etc.
    },
    customer_info: {
        pid: '<unique identifier representing user>',
        email: '<email address of user>',
        phone: '<phone number of user - no country code>',
        country: '<country code only>',
        city: '<city>',
        state: '<state>',
        fName: '<first name of user>',
        lName: '<last name of user>',
        zip: '<zip code>',
    },
    session_info: {
        /* Refer to Session Information page in reference below */
    }
}
```

{% content-ref url="/pages/shPp2T99nOk830TF3gkl" %}
[Products Array](/implementation/s2s/tracking-events/products-array.md)
{% endcontent-ref %}

{% content-ref url="/pages/crhBMNZAuGpFGvVmrI7F" %}
[Session Information](/implementation/s2s/tracking-events/session-information.md)
{% endcontent-ref %}


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