curl  -H "Authorization: Bearer YOUR_ACCESS_TOKEN" "https://api.intra.42.fr/v2/internships/2350"

{
  "id": 2350,
  "administration_id": 1,
  "offer_id": null,
  "language_id": 1,
  "state": "uploaded",
  "days": "[\"monday\",\"tuesday\",\"wednesday\",\"thursday\",\"friday\"]",
  "user_address": "5 rue de la paix",
  "user_postal": "75001",
  "user_city": "Paris",
  "user_country": "France",
  "company_name": "Association 42",
  "company_boss_user_first_name": "FirstName",
  "company_boss_user_last_name": "LastName",
  "company_boss_user_email": "boss@42.fr",
  "company_boss_user_phone": "0123456789",
  "company_user_first_name": "Quentin",
  "company_user_last_name": "Bollache",
  "company_user_post": "Responsable technique et pedagogique",
  "company_user_email": "gargamel@42.fr",
  "company_user_phone": "0123456789",
  "company_address": "96 Boulevard Bessières",
  "company_postal": "75017",
  "company_city": "Paris",
  "company_country": "France",
  "company_siret": "0",
  "internship_address": "96 Boulevard Bessières",
  "internship_postal": "75017",
  "internship_city": "Paris",
  "internship_country": "France",
  "contract_type": "stage",
  "subject": "Développement de tous les sites web reliés à 42",
  "start_at": "2017-07-31T22:00:00.000Z",
  "end_at": "2018-01-30T23:00:00.000Z",
  "duration": 6,
  "nb_days": 5,
  "nb_hours": 35,
  "movement": null,
  "salary": 50000,
  "currency": "eur",
  "breach_at": null,
  "convention": {
    "convention": {
      "url": "/uploads/internship/convention/jgengo-9543c17018c04a7f99fd01bf62a478/2350/jgengo.zip"
    }
  },
  "user": {
    "id": 19265,
    "login": "jgengo",
    "url": "http://localhost:13000/v2/users/jgengo"
  }
}

require "oauth2"
UID = "Your application uid"
SECRET = "Your application secret"
client = OAuth2::Client.new(UID, SECRET, site: "https://api.intra.42.fr")
token = client.client_credentials.get_token

response = token.get("/v2/internships/2350")
response.status
# => 200
response.parsed
# => {"id"=>2350, "administration_id"=>1, "offer_id"=>nil, "language_id"=>1, "state"=>"uploaded", "days"=>"[\"monday\",\"tuesday\",\"wednesday\",\"thursday\",\"friday\"]", "user_address"=>"5 rue de la paix", "user_postal"=>"75001", "user_city"=>"Paris", "user_country"=>"France", "company_name"=>"Association 42", "company_boss_user_first_name"=>"FirstName", "company_boss_user_last_name"=>"LastName", "company_boss_user_email"=>"boss@42.fr", "company_boss_user_phone"=>"0123456789", "company_user_first_name"=>"Quentin", "company_user_last_name"=>"Bollache", "company_user_post"=>"Responsable technique et pedagogique", "company_user_email"=>"gargamel@42.fr", "company_user_phone"=>"0123456789", "company_address"=>"96 Boulevard Bessières", "company_postal"=>"75017", "company_city"=>"Paris", "company_country"=>"France", "company_siret"=>"0", "internship_address"=>"96 Boulevard Bessières", "internship_postal"=>"75017", "internship_city"=>"Paris", "internship_country"=>"France", "contract_type"=>"stage", "subject"=>"Développement de tous les sites web reliés à 42", "start_at"=>"2017-07-31T22:00:00.000Z", "end_at"=>"2018-01-30T23:00:00.000Z", "duration"=>6, "nb_days"=>5, "nb_hours"=>35, "movement"=>nil, "salary"=>50000, "currency"=>"eur", "breach_at"=>nil, "convention"=>{"convention"=>{"url"=>"/uploads/internship/convention/jgengo-9543c17018c04a7f99fd01bf62a478/2350/jgengo.zip"}}, "user"=>{"id"=>19265, "login"=>"jgengo", "url"=>"http://localhost:13000/v2/users/jgengo"}}