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

# Find customers who bought a specific product

> Reach the customers who have bought a given product in a recent window.

Product-level targeting is the most common starting point for a promotion: find everyone who bought chocolate in the last 90 days, then send them something.

## What you'll build

```mermaid theme={"system"}
flowchart LR
    A[Member Segment block] --> B[Channel block]
```

## Segment criteria

| Attribute     | What it does here                                                  |
| ------------- | ------------------------------------------------------------------ |
| Product       | Restricts the segment to customers who bought the product you pick |
| Purchase date | Sets the look-back window, for example the last 90 days            |
| Amount spent  | Optional — adds a spend floor on top of the product condition      |

## Steps

<Steps>
  <Step>
    ### Start a new campaign

    Open the **Campaigns** tab and select **Add new campaign**.
  </Step>

  <Step>
    ### Add a Member Segment block and configure the Product attribute

    Pick the product that qualifies. See [Audiences & Data](/business-documentation/audiences-and-data) for the segment builder.
  </Step>

  <Step>
    ### Add the Purchase date window

    Set the look-back period — 90 days in this example.
  </Step>

  <Step>
    ### Add a Channel block and connect it to the Member Segment block

    See [Channels](/business-documentation/channels) for what each channel does.
  </Step>

  <Step>
    ### Run the campaign

    Wait for the execution to finish, then download the outcome and check the results.
  </Step>
</Steps>

## Variations

| Instead of          | Change                                                    |
| ------------------- | --------------------------------------------------------- |
| One product         | Widen the Product condition to a category or a list       |
| 90 days             | Any Purchase date window that matches the promotion cycle |
| Everyone who bought | Add Amount spent to reach only higher-value buyers        |

## Related

* [Block reference](/business-documentation/journeys/block-reference)
* [Schedule a campaign and check its results](/business-documentation/use-cases/schedule-a-campaign-and-check-its-results)

<Info>
  **Migration note.** Rewritten from `Segmentation > User exercises > Configure campaign which will find members who have bought chocolate the last 90 days`. The original showed the criteria only as a screenshot; the attributes are now in the table above.
</Info>