curl --request GET \
  --url https://api.tryarchitect.com/v0/page_groups/{page_group_id}/utm_parameters

{
  "parameters": {
    "utm_campaigns": [
      "<string>"
    ],
    "utm_contents": [
      "<string>"
    ],
    "utm_mediums": [
      "<string>"
    ],
    "utm_sources": [
      "<string>"
    ],
    "utm_terms": [
      "<string>"
    ]
  }
}