---
title: "Delete a customer"
method: DELETE
path: "/api/v1/customers/{identifier}"
tags: ["Track Customers"]
---

# Delete a customer

`DELETE /api/v1/customers/{identifier}`

Deleting a customer removes them, and all of their information, from Customer.io.

**NOTE**: Calls that update customers by ID can also create a customer. If you send data to Customer.io through other means (like the Javascript snippet), after you delete a customer, you may accidentally recreate the customer. You cannot delete a customer using the Javascript snippet alone.

## Path parameters

- `identifier` union, required
  - string — The unique identifier for a person that you want to create or modify.
  - string — A person's email address. If adding a new person in an email-based workspace, you must use this value.
  - string, cio_[a-zA-Z0-9]* — A canonical identifier assigned by Customer.io when you add a person. When referencing a person by this value, you must prefix the value with `cio_`. You can [look up a person using the App API](/integrations/api/app/tag/customers/) to find their `cio_id`. You must use this value to update a person's other identifiers—their `id` or `email`, unless you enable your workspace's [Allow updates to email using ID](/accounts/workspaces#update-email-with-id) setting.

## Response `200`

A successful request returns an empty object response.

## Other responses

- `401` — Unauthorized request. Make sure that you provided the right credentials.

---

[API](https://skmtc.dev/customer/apis/customer-io-journeys-api-reference.md) · [All operations](https://skmtc.dev/customer/apis/customer-io-journeys-api-reference/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/customer/customer-io-journeys-api-reference/revisions/4b391af7cb06/schema)