curl --request GET \
  --url https://api.ngrok.com/edges/tls/{id}/mutual_tls \
  --header 'Authorization: Bearer <token>' \
  --header 'ngrok-version: <ngrok-version>'

{
  "enabled": true,
  "certificate_authorities": [
    {
      "id": "<string>",
      "uri": "<string>"
    }
  ]
}