init static method
Sets host and schemes for print, checkout and cancel responses from Lio
Implementation
static init({String? host, SchemeAggregate? schemes}) {
_printer = PrinterService(schemes!.printResponseScheme, host, _channel);
_paymentService =
PaymentService(schemes.paymentResponseScheme, host, _channel);
_cancelService =
CancelService(schemes.reversalResponseScheme, host, _channel);
}