curl --request GET \
  --url https://prod.featherhq.com/api/v1/integrations/instances \
  --header 'X-API-Key: <api-key>'

{
  "integrationInstances": [
    {
      "id": "<string>",
      "name": "<string>",
      "slug": "<string>",
      "integrationId": "<string>",
      "integration": {
        "id": "<string>",
        "name": "<string>",
        "type": "<string>"
      },
      "createdAt": "<string>",
      "updatedAt": "<string>"
    }
  ]
}