Customer at the jeans shop. Customer want to buy jeans. Customer order to seller but customer will have to wait another 10 minutes.
Seller receive order from customer and seller inform to store. Store receive order from seller therefore check goods.
The store updating data and prepared goods for send to seller. Seller receive goods from store and send to customer.
Customer receive goods from seller if customer satisfaction product to pay and go out the shop.
On the other hand customer not satisfaction make to complain.
In sub-process of complain is seller check goods and change of new product to customer until the customer is satisfied in the product.