curl --request GET \
  --url https://api.gextra.net/fr/etablissements/{group}

{
  "etablissements": [
    {
      "id": 123,
      "groupement_id": 123,
      "groupeName": "<string>",
      "groupeDetail": "<string>",
      "name": "<string>",
      "seoTitleJob": "<string>",
      "slug": "<string>",
      "siret": "<string>",
      "urssafRef": "<string>",
      "urssafNum": "<string>",
      "pictureName": "<string>",
      "about": "<string>",
      "tvaNum": "<string>",
      "logoName": "<string>",
      "prefectureEmail": "<string>",
      "prefectureFax": "<string>",
      "regimeRetraite": "<string>",
      "convention": "<string>",
      "collector": "<string>",
      "status": "<string>",
      "capital": "<string>",
      "rcsRef": "<string>",
      "rcsNum": "<string>",
      "regimePrevoyance": "<string>",
      "regimeMutuelle": "<string>",
      "banque": "<string>",
      "bic": "<string>",
      "iban": "<string>",
      "sepa": "<string>",
      "phone": "<string>",
      "email": "<string>",
      "address": "<string>",
      "cp": "<string>",
      "city": "<string>",
      "lat": "<string>",
      "lng": "<string>",
      "googlemapLink": "<string>"
    }
  ],
  "personnel": {
    "nb": 123
  },
  "medecins": {
    "nb": 123
  }
}