Demo process flow

application/flow/Order product.md

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+# Order product
+
+* Form `Order`
+* Reservation
+  - Notify "The product is out of stock"
+* Form `Payment`
+* Payment
+  + Notify "Payment was successful"
+  - > Return payment
+* Pick up from the warehouse
+  - > Return to the warehouse
+* Shipping by carrier
+  + Notify "The product was successfully sent"
+  - Notify "The product was not sent"
+* Finalization
+  + Product feedback
+  + Service feedback
+
+# Reservation
+
+* `getStockBalance(Order): Balance`
+* `checkStockBalance(Order, Balance): Availability`
+* `makeReservation(Order, Balance, Availability): Reservation`
+
+# Pick up from the warehouse
+
+* `pickProduct(Reservation): Package`
+* `removeReservation(Reservation)`
+
+# Return to the warehouse
+
+* `returnProduct(Package): Return`
+
+# Payment
+
+* `makePayment(Order): Payment`
+
+# Return payment
+
+* `returnPayment(Payment): Refund`
+
+# Shipping by carrier
+
+* `selectCarrier(Order, Package): Carrier`
+* `makeShipment(Package, Carrier): Shipment`