Save reconciliation dates returned in seat usage API response

Save the reconciliation dates in the UpcomingReconciliation model.

ee/app/workers/sync_seat_link_request_worker.rb

@@ -25,6 +25,8 @@ class SyncSeatLinkRequestWorker
 
     if response.success?
       reset_license!(response['license']) if response['license']
+
+      save_reconciliation_dates!(response)
     else
       raise RequestError, request_error_message(response)
     end
@@ -59,4 +61,19 @@ class SyncSeatLinkRequestWorker
   def request_error_message(response)
     "Seat Link request failed! Code:#{response.code} Body:#{response.body}"
   end
+
+  def save_reconciliation_dates!(response)
+    return if response['next_reconciliation_date'].blank? || response['display_alert_from'].blank?
+
+    attributes = {
+      next_reconciliation_date: Date.parse(response['next_reconciliation_date']),
+      display_alert_from: Date.parse(response['display_alert_from'])
+    }
+
+    if (reconciliation = GitlabSubscriptions::UpcomingReconciliation.next)
+      reconciliation.update!(attributes)
+    else
+      GitlabSubscriptions::UpcomingReconciliation.create!(attributes)
+    end
+  end
 end

ee/spec/workers/sync_seat_link_request_worker_spec.rb

@@ -123,6 +123,40 @@ RSpec.describe SyncSeatLinkRequestWorker, type: :worker do
       end
     end
 
+    context 'when response contains reconciliation dates' do
+      let(:body) { { success: true, next_reconciliation_date: today.to_s, display_alert_from: (today - 7.days).to_s }.to_json }
+      let(:today) { Date.current }
+
+      before do
+        stub_request(:post, seat_link_url).to_return(
+          status: 200,
+          body: body,
+          headers: { content_type: 'application/json' }
+        )
+      end
+
+      it 'saves the reconciliation dates' do
+        sync_seat_link
+        upcoming_reconciliation = GitlabSubscriptions::UpcomingReconciliation.next
+
+        expect(upcoming_reconciliation.next_reconciliation_date).to eq(today)
+        expect(upcoming_reconciliation.display_alert_from).to eq(today - 7.days)
+      end
+
+      context 'when an upcoming_reconciliation already exists' do
+        it 'updates the upcoming_reconciliation' do
+          create(:upcoming_reconciliation, :self_managed, next_reconciliation_date: today + 2.days, display_alert_from: today + 1.day)
+
+          sync_seat_link
+
+          upcoming_reconciliation = GitlabSubscriptions::UpcomingReconciliation.next
+
+          expect(upcoming_reconciliation.next_reconciliation_date).to eq(today)
+          expect(upcoming_reconciliation.display_alert_from).to eq(today - 7.days)
+        end
+      end
+    end
+
     shared_examples 'unsuccessful request' do
       context 'when the request is not successful' do
         before do