Get customer detail by customerId

{
  "id": 0,
  "externalId": "string",
  "role": "customer",
  "metadata": {
    "arbitraryKey": "arbitraryValue"
  },
  "priority": 0,
  "email": "user@example.com",
  "firstName": "string",
  "lastName": "string",
  "phone": "string"
}

{
  "message": "Invalid request body",
  "type": "E_INVALID_BODY",
  "errors": [
    {
      "error": "\"email\" is required",
      "rule": "any.required",
      "field": "\"email\""
    }
  ]
}