invoice_item_1:
  id: 1
  invoice_id: 1
  stp_invoice_item_id: sub_8DGB4ErIc2asOv
  amount: 10000
  created_at: 2016-04-05 08:35:52.934725000 Z
  updated_at: 2016-04-05 08:35:52.934725000 Z
  description: Sleede - standard, association - month
  subscription_id: 1
  invoice_item_id: 

invoice_item_2:
  id: 2
  invoice_id: 2
  stp_invoice_item_id: 
  amount: 2000
  created_at: 2016-04-05 08:36:46.856021000 Z
  updated_at: 2016-04-05 08:36:46.856021000 Z
  description: Mensuel tarif réduit - étudiant, - de 25 ans, enseignant, demandeur
    d'emploi - month
  subscription_id: 2
  invoice_item_id: