curl --request GET \
  --url https://api.xpander.ai/v1/custom_functions \
  --header 'x-api-key: <api-key>'

{
  "items": [
    {
      "id": "<string>",
      "name": "<string>",
      "description": "<string>",
      "technical_description": "<string>",
      "status": "<string>",
      "limits": {
        "max_run_time": 15
      },
      "input_schema": {},
      "source_code": "<string>",
      "analysis_error_details": "<string>",
      "organization_id": "<string>",
      "created_at": "<string>"
    }
  ],
  "total": 123,
  "page": 123,
  "per_page": 123,
  "total_pages": 123
}