curl --request GET \
  --url https://app.dynamicauth.com/api/v0/environments/{environmentId}/statistics/visitors \
  --header 'Authorization: Bearer <token>'

{
  "users": {
    "count": 123,
    "uniquePastMonth": 123
  },
  "visitors": {
    "count": 123,
    "uniquePastMonth": 123
  }
}