# SY30023: The customer with id: `$customer_id` does not exist.

Source: https://developer.synup.com/errors/sy30023

Documented under Review Campaigns.

```json
{
  "data": null,
  "errors": [
    {
      "message": "The customer with id: `$customer_id` does not exist.",
      "context": {},
      "code": "SY30023"
    }
  ]
}
```