on
fun WebApp.onEvent(type: EventType.ViewportChanged, eventHandler: ViewportChangedEventHandler): (ViewportChangedData) -> Unit
fun WebApp.onEvent(type: EventType.InvoiceClosed, eventHandler: InvoiceClosedEventHandler): (InvoiceClosedInfo) -> Unit
fun WebApp.onEvent(type: EventType.PopupClosed, eventHandler: PopupClosedEventHandler): (String?) -> Unit
Return
The callback which should be used in case you want to turn off events handling