Handle setting of payment amount during checkout in OrderUpdater

engines/order_management/app/services/order_management/order/updater.rb

@@ -35,6 +35,14 @@ module OrderManagement
         end
 
         persist_totals
+        update_pending_payment
+      end
+
+      def update_pending_payment
+        return unless order.state.in? ["payment", "confirmation"]
+        return unless order.pending_payments.any?
+
+        order.pending_payments.first.update_attribute :amount, order.total
       end
 
       # Updates the following Order total values:

spec/controllers/split_checkout_controller_spec.rb

@@ -165,6 +165,7 @@ describe SplitCheckoutController, type: :controller do
 
           expect(order.state).to eq "confirmation"
           expect(order.payments.first.adjustment.amount).to eq 1.23
+          expect(order.payments.first.amount).to eq order.item_total + order.adjustment_total
           expect(order.adjustment_total).to eq 1.23
           expect(order.total).to eq order.item_total + order.adjustment_total
         end

spec/services/process_payment_intent_spec.rb

@@ -129,6 +129,8 @@ describe ProcessPaymentIntent do
 
         it "completes the order, but with failed payment state recorded" do
           service.call!
+          order.reload
+
           expect(order.state).to eq("complete")
           expect(order.payment_state).to eq("failed")
           expect(order).to have_received(:deliver_order_confirmation_email)