6.3.2.6 Update UI with status of payment service

In order to display the price for products the UI needs to get the price information of the products. This is done calling the corresponding Methods of the PriceInformation Object of the payment service. The price may depend on the UserId and PaymentMode, therefore the UI needs to call the Methods each time, this is changing. In addition, the UI should subscribe to Events of the PriceChangeEventType to get the information, when the price information was changed and the Methods need to be called, again.

When the UI has requested a delivery, it needs to subscribe to the TransactionProgress Variable of the Delivery Object to get updates on the progress of the payment.

In case a basket is requested, it needs to subscribe to the overall basket status in the BasketProgress Variable.

In case the user is filling a basket, the UI needs to call the GetPriceForBasket Method of the PriceInformation Object each time the content of the basket is changing (adding or removing items) to get the price for the current basket.

The UI may use the Status Variable of the Status Object to display the overall status of the Vending Machine.