# Customer.io (Cohort Sync)

Source: https://amplitude.com/docs/data/destination-catalog/customer-io-cohort-syncing

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On this page

- [Considerations](#considerations)
- [Set up the integration](#set-up-the-integration)
- [Customer.io setup](#customerio-setup)
- [Amplitude setup](#amplitude-setup)
- [Send a cohort](#send-a-cohort)
- [Use the cohort in Customer.io](#use-the-cohort-in-customerio)

# Customer.io (Cohort Sync)

[Customer.io](http://customer.io/) is a messaging platform that helps marketers turn ideas into automated message campaigns. Customer.io's logic-based tools help you capture edge cases and connect with people in your audience.

Send Amplitude events to Customer.io

This integration sends Amplitude cohorts to Customer.io. A separate integration sends Amplitude events. Refer to [Send events to Customer.io](/docs/data/destination-catalog/customer-io) for details.

## Considerations

- This integration is only available for customers with paid Amplitude plans.
- The users in your cohort must exist in Customer.io before the sync from Amplitude. Customer.io ignores users that don't exist and excludes them from the sync.
- Enable this integration in each Amplitude project you want to use it in.
- To use this integration for EU data centers, specify the EU region during setup.

## Set up the integration

### Customer.io setup

1. Find your Customer.io API key by opening Customer.io and navigating to **Account Settings > API Credentials**.
2. Copy the **Tracking API Key**, the **Site ID**, and **App API Key**.

### Amplitude setup

1. In Amplitude Data, click **Catalog** and select the **Destinations** tab.
2. In the Cohort section, click **Customer.io**.
3. Enter a name, tracking API key, site ID, and app API key.
4. Select a region.
5. Map an Amplitude property to the Customer.io user ID.
6. Save when finished.

## Send a cohort

1. From the Cohorts page in Amplitude, click the cohort you want to send, or create a cohort.
2. Click **Sync**.
3. Select **Customer.io**, then click **Next**.
4. From the *Select an API target to sync to list*, select your destination.
5. Set the sync cadence.
6. When finished, click **Sync**.

## Use the cohort in Customer.io

After you export the cohort, view it in the [Segments](https://customer.io/docs/segments/) section of Customer.io. Use segments as recipient lists, campaign triggers, filters, conversion goals, and more. Use a segment whenever you need to reference a subset of the people in your workspace.

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