curl --request GET \
  --url https://api.{your-broker}.slate-labs.com/prop/journeys/{journey_id}/activity \
  --header 'Authorization: Bearer <token>'

{
  "items": [
    {
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "type": "<string>",
      "body": "<string>",
      "metadata": {},
      "created_at": "<string>"
    }
  ]
}