Added the ability to select a device for printing a receipt “Invoice”

Starting with version Syrve 6.4, API V6 added the ability to explicitly specify where a receipt of the “Invoice‎” type will be printed.

The “Invoice‎” type check is used in some countries, for example in Latvia. Not all models of fiscal recorders support printing receipts of the “Invoice‎” type. For devices written in API Equipment support for printing checks of the “Invoice‎” type is enabled via CashRegisterDriverParameters by specifying IsBillTaskSupported = true. A check like “Invoice‎” is a command ICashRegister.DoBillCheque(). The IsBillTaskSupported = true configuration assumes that the Invoice number is required in the payment receipt command. Therefore, in the results of the DoBillCheque command, the CashRegisterResult.BillNumber field must be filled in.

At the time of printing the guest bill the Syrve POS core polls subscribers “At which point of sale should I print the Invoice for this order?”. Registering a router for printing receipts of the “Invoice‎” type is carried out using the method INotificationsService.BillChequePosResolving():

• The method accepts a function with arguments IOrder “order” and bool “this is the return of the bill”.
• The function should return IPointOfSale: the point of sale to which the command for a check of type “Invoice‎” will be sent.
• If the function returns null or throws an exception, then the command for a check of type “Invoice‎” will not be sent anywhere.

Example code for a primitive case when Invoice printing should occur on the fiscal registrar of the current machine:

var pointsOfSales = PluginContext.Operations.GetHostTerminalPointsOfSale();
var currentPos = pointsOfSales.FirstOrDefault();

if (currentPos != null)

{      subscriptions.Push(PluginContext.Notifications.BillChequePosResolving.Subscribe(_ => currentPos)); }