diff --git a/engines/order_management/app/services/order_management/order/updater.rb b/engines/order_management/app/services/order_management/order/updater.rb
index 497991d18f..97b77ace28 100644
--- a/engines/order_management/app/services/order_management/order/updater.rb
+++ b/engines/order_management/app/services/order_management/order/updater.rb
@@ -234,7 +234,10 @@ module OrderManagement
       end
 
       def update_pending_payment
-        return unless order.state.in? ["payment", "confirmation"]
+        # We only want to update complete order pending payment when it's a cash payment. We assume
+        # that if the payment was a credit card it would alread have been processed, so we don't
+        # bother checking the payment type
+        return unless order.state.in? ["payment", "confirmation", "complete"]
         return unless order.pending_payments.any?
 
         order.pending_payments.first.update_attribute :amount, order.total
diff --git a/engines/order_management/spec/services/order_management/order/updater_spec.rb b/engines/order_management/spec/services/order_management/order/updater_spec.rb
index 127b678ece..3dab32c37e 100644
--- a/engines/order_management/spec/services/order_management/order/updater_spec.rb
+++ b/engines/order_management/spec/services/order_management/order/updater_spec.rb
@@ -105,6 +105,20 @@ module OrderManagement
           expect(shipment).to receive(:update!).with(order)
           updater.update_shipments
         end
+
+        context "whith pending payments" do
+          let(:order) { create(:completed_order_with_totals) }
+
+          it "updates pending payments" do
+            payment = create(:payment, order: , amount: order.total)
+
+            # update order so the order total will change
+            update_order_quantity(order)
+            order.payments.reload
+
+            expect { updater.update }.to change { payment.reload.amount }.from(50).to(60)
+          end
+        end
       end
 
       context "incompleted order" do