diff --git a/app/models/attestation.rb b/app/models/attestation.rb
index 605ed11a4..6d9cdc357 100644
--- a/app/models/attestation.rb
+++ b/app/models/attestation.rb
@@ -2,4 +2,13 @@ class Attestation < ApplicationRecord
   belongs_to :dossier
 
   mount_uploader :pdf, AttestationUploader
+
+  def pdf_url
+    if Rails.application.secrets.fog[:enabled]
+      RemoteDownloader.new(pdf.path).url
+    elsif pdf&.url
+      # FIXME: this is horrible but used only in dev and will be removed after migration
+      File.join(LOCAL_DOWNLOAD_URL, pdf.url)
+    end
+  end
 end
diff --git a/app/models/dossier.rb b/app/models/dossier.rb
index f13fb26db..3aee61aa1 100644
--- a/app/models/dossier.rb
+++ b/app/models/dossier.rb
@@ -144,7 +144,9 @@ class Dossier < ApplicationRecord
         :etablissement,
         piece_justificative_file_attachment: :blob
       ],
-      avis: [],
+      justificatif_motivation_attachment: :blob,
+      attestation: [],
+      avis: { piece_justificative_file_attachment: :blob },
       etablissement: [],
       individual: [],
       user: [])
diff --git a/app/serializers/dossier_serializer.rb b/app/serializers/dossier_serializer.rb
index ce90de67c..dbd3e03ad 100644
--- a/app/serializers/dossier_serializer.rb
+++ b/app/serializers/dossier_serializer.rb
@@ -14,6 +14,9 @@ class DossierSerializer < ActiveModel::Serializer
     :motivation,
     :instructeurs
 
+  attribute :attestation, if: :include_attestation?
+  attribute :justificatif_motivation, if: :include_justificatif_motivation?
+
   has_one :individual
   has_one :entreprise
   has_one :etablissement
@@ -22,7 +25,6 @@ class DossierSerializer < ActiveModel::Serializer
   has_many :champs_private
   has_many :pieces_justificatives
   has_many :types_de_piece_justificative
-  has_one :justificatif_motivation
   has_many :avis
 
   has_many :champs, serializer: ChampSerializer
@@ -53,10 +55,12 @@ class DossierSerializer < ActiveModel::Serializer
     PiecesJustificativesService.serialize_champs_as_pjs(object)
   end
 
+  def attestation
+    object.attestation.pdf_url
+  end
+
   def justificatif_motivation
-    if object.justificatif_motivation.attached?
-      Rails.application.routes.url_helpers.url_for(object.justificatif_motivation)
-    end
+    Rails.application.routes.url_helpers.url_for(object.justificatif_motivation)
   end
 
   def types_de_piece_justificative
@@ -102,4 +106,12 @@ class DossierSerializer < ActiveModel::Serializer
   def processed_at
     object.processed_at&.in_time_zone('UTC')
   end
+
+  def include_attestation?
+    object.accepte?
+  end
+
+  def include_justificatif_motivation?
+    object.justificatif_motivation.attached?
+  end
 end
diff --git a/spec/controllers/api/v1/dossiers_controller_spec.rb b/spec/controllers/api/v1/dossiers_controller_spec.rb
index bb2fd8a2f..2ea28a353 100644
--- a/spec/controllers/api/v1/dossiers_controller_spec.rb
+++ b/spec/controllers/api/v1/dossiers_controller_spec.rb
@@ -154,10 +154,10 @@ describe API::V1::DossiersController do
       context 'when dossier exists and belongs to procedure' do
         let(:procedure_id) { procedure.id }
         let(:date_creation) { Time.zone.local(2008, 9, 1, 10, 5, 0) }
-        let!(:dossier) { Timecop.freeze(date_creation) { create(:dossier, :with_entreprise, :en_construction, procedure: procedure, motivation: "Motivation") } }
+        let!(:dossier) { Timecop.freeze(date_creation) { create(:dossier, :with_entreprise, :with_attestation, :accepte, procedure: procedure, motivation: "Motivation") } }
         let(:dossier_id) { dossier.id }
         let(:body) { JSON.parse(retour.body, symbolize_names: true) }
-        let(:field_list) { [:id, :created_at, :updated_at, :archived, :individual, :entreprise, :etablissement, :cerfa, :types_de_piece_justificative, :pieces_justificatives, :champs, :champs_private, :commentaires, :state, :simplified_state, :initiated_at, :processed_at, :received_at, :motivation, :email, :instructeurs, :justificatif_motivation, :avis] }
+        let(:field_list) { [:id, :created_at, :updated_at, :archived, :individual, :entreprise, :etablissement, :cerfa, :types_de_piece_justificative, :pieces_justificatives, :champs, :champs_private, :commentaires, :state, :simplified_state, :initiated_at, :processed_at, :received_at, :motivation, :email, :instructeurs, :attestation, :avis] }
         subject { body[:dossier] }
 
         it 'return REST code 200', :show_in_doc do
@@ -165,7 +165,7 @@ describe API::V1::DossiersController do
         end
 
         it { expect(subject[:id]).to eq(dossier.id) }
-        it { expect(subject[:state]).to eq('initiated') }
+        it { expect(subject[:state]).to eq('closed') }
         it { expect(subject[:created_at]).to eq('2008-09-01T08:05:00.000Z') }
         it { expect(subject[:updated_at]).to eq('2008-09-01T08:05:00.000Z') }
         it { expect(subject[:archived]).to eq(dossier.archived) }