> ## Documentation Index
> Fetch the complete documentation index at: https://docs.upstackdata.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Add Billing Info: Track Checkout Payment Events

> Track when visitors enter billing information during checkout. Monitor payment step completion rates to identify checkout friction points.

<Tip>
  Add Billing Info counts the total times visitors submitted their billing or payment information during checkout.
</Tip>

## Formula

<Info>
  **Add Billing Info** = **COUNT** ( add\_billing\_info events )
</Info>

### Formula Components

| Metric                        | Definition                                                                             |
| ----------------------------- | -------------------------------------------------------------------------------------- |
| **add\_billing\_info events** | Individual events fired when a visitor enters billing information in the checkout flow |

| Metadata        |                         |
| --------------- | ----------------------- |
| **Type**        | Number                  |
| **Data Source** | [Upstack Pixel](/pixel) |
| **Aggregation** | Count                   |

***

## Example

Your Shopify store had **2,847 visitors initiate checkout** last week, and **1,923 of them entered billing information**.

| Stage             | Count | Drop-off |
| ----------------- | ----- | -------- |
| Initiate Checkout | 2,847 | —        |
| Add Billing Info  | 1,923 | 32.4%    |
| Purchase          | 1,654 | 14.0%    |

***

## How It Works

The Add Billing Info event fires when a visitor enters payment or billing details during the checkout process. This typically occurs after shipping information is entered and before the final purchase confirmation. Tracking this step helps identify where visitors abandon the checkout funnel.

***

## When to Use

| Scenario                  | Action                                                                      |
| ------------------------- | --------------------------------------------------------------------------- |
| High checkout abandonment | Compare Add Billing Info to Initiate Checkout to find payment step friction |
| Payment method testing    | Monitor billing completion rates when adding new payment options            |
| Checkout optimization     | Identify if billing form complexity causes drop-offs                        |
| Fraud concerns            | Spike in billing entries without purchases may indicate testing behavior    |

***

## Related Metrics

| Metric                                                                        | Relationship                               |
| ----------------------------------------------------------------------------- | ------------------------------------------ |
| [Initiate Checkouts](/reference/metrics/funnel/engagement/initiate-checkouts) | Previous step in the checkout funnel       |
| [Purchases](/reference/metrics/funnel/conversions/purchases)                  | Next step after billing info is entered    |
| [Add Shipping Info](/reference/metrics/funnel/engagement/add-shipping-info)   | Related checkout step for shipping details |

[See all Engagement metrics →](/reference/metrics/funnel/engagement)