diff --git a/spec/requests/submissions_spec.rb b/spec/requests/submissions_spec.rb
index 502f6520..020bd908 100644
--- a/spec/requests/submissions_spec.rb
+++ b/spec/requests/submissions_spec.rb
@@ -104,6 +104,21 @@ describe 'Submission API', type: :request do
       expect(response.parsed_body).to eq(JSON.parse(create_submission_body(submission).to_json))
     end
 
+    it 'creates a submission when the submitter is marked as completed' do
+      post '/api/submissions', headers: { 'x-auth-token': author.access_token.token }, params: {
+        template_id: templates[0].id,
+        submitters: [{ role: 'First Party', email: 'john.doe@example.com', completed: true }]
+      }.to_json
+
+      expect(response).to have_http_status(:ok)
+
+      submission = Submission.last
+      submitter = submission.submitters.first
+
+      expect(submitter.status).to eq('completed')
+      expect(submitter.completed_at).not_to be_nil
+    end
+
     it 'creates a submission when some submitter roles are not provided' do
       post '/api/submissions', headers: { 'x-auth-token': author.access_token.token }, params: {
         template_id: multiple_submitters_template.id,
@@ -395,7 +410,7 @@ describe 'Submission API', type: :request do
         preferences: { send_email: true, send_sms: false },
         role: submitter.template.submitters.find { |s| s['uuid'] == submitter.uuid }['name'],
         embed_src: "#{Docuseal::DEFAULT_APP_URL}/s/#{submitter.slug}",
-        values: []
+        values: Submitters::SerializeForWebhook.build_values_array(submitter)
       }
     end
   end
diff --git a/spec/requests/submitters_spec.rb b/spec/requests/submitters_spec.rb
index ffe35cd9..023de7ee 100644
--- a/spec/requests/submitters_spec.rb
+++ b/spec/requests/submitters_spec.rb
@@ -95,6 +95,23 @@ describe 'Submitter API', type: :request do
       expect(submitter.email).to eq('john.doe+updated@example.com')
       expect(response.parsed_body).to eq(JSON.parse(update_submitter_body(submitter).to_json))
     end
+
+    it 'marks a submitter as completed' do
+      submitter = create(:submission, :with_submitters, :with_events,
+                         template: templates[0],
+                         created_by_user: author).submitters.first
+
+      put "/api/submitters/#{submitter.id}", headers: { 'x-auth-token': author.access_token.token }, params: {
+        completed: true
+      }.to_json
+
+      expect(response).to have_http_status(:ok)
+
+      submitter.reload
+
+      expect(submitter.status).to eq('completed')
+      expect(submitter.completed_at).not_to be_nil
+    end
   end
 
   private
@@ -134,8 +151,8 @@ describe 'Submitter API', type: :request do
           data: event.data.slice(:reason)
         }
       end,
-      values: [],
-      documents: [],
+      values: Submitters::SerializeForWebhook.build_values_array(submitter),
+      documents: Submitters::SerializeForWebhook.build_documents_array(submitter),
       role: submitter.template.submitters.find { |s| s['uuid'] == submitter.uuid }['name']
     }
   end