fix(payment): CHECKOUT-000 Fix issue with offsite payment completion (#1786)

Author: animesh1987

packages/core/src/order-billing-address/order-billing-address-reducer.spec.ts

@@ -22,4 +22,13 @@ describe('orderBillingAddressReducer', () => {
             data: action.payload && action.payload.billingAddress,
         });
     });
+
+    it('returns billing address for offsite payment', () => {
+        const action = createAction(OrderActionType.LoadOrderPaymentsSucceeded, getOrder());
+        const output = orderBillingAddressReducer(initialState, action);
+
+        expect(output).toEqual({
+            data: action.payload && action.payload.billingAddress,
+        });
+    });
 });

packages/core/src/order-billing-address/order-billing-address-reducer.ts

@@ -24,6 +24,7 @@ function dataReducer(
     action: OrderAction,
 ): OrderBillingAddress | undefined {
     switch (action.type) {
+        case OrderActionType.LoadOrderPaymentsSucceeded:
         case OrderActionType.LoadOrderSucceeded:
             return replace(data, action.payload && action.payload.billingAddress);