curl --request GET \
  --url https://api.callab.ai/v1/campaigns/by-workspace/{workspace} \
  --header 'Authorization: Bearer <token>'

{
  "status": "ok",
  "message": "<string>",
  "data": [
    {
      "name": "<string>",
      "notes": "<string>",
      "status": "<string>",
      "campaign_type": "<string>",
      "contacts_list_source": [
        "<string>"
      ],
      "contacts_list_tags": [
        "<string>"
      ],
      "contacts_list_categories": [
        "<string>"
      ],
      "contacts_list_source_metadata": {},
      "agent_variables_contact_metadata_mapping": {},
      "call_progress": 123,
      "call_time_of_day_from": "<string>",
      "call_time_of_day_to": "<string>",
      "number_of_call_attempts": [
        123
      ],
      "retry_delay": [
        123
      ],
      "retry_delay_unit": [
        "<string>"
      ],
      "days_of_week": [
        4
      ],
      "time_zone": "<string>",
      "created_at": "2023-11-07T05:31:56Z",
      "updated_at": "2023-11-07T05:31:56Z",
      "deleted_at": "2023-11-07T05:31:56Z",
      "started_at": "2023-12-25",
      "ended_at": "2023-12-25",
      "webhook_mapping_variables": {},
      "webhook_mapping_variables_sources": {},
      "workspace": "<string>"
    }
  ]
}