pay method

Implementation

@override
Future<void> pay(PayEntity paymentModel) async {
  _paymentModel = paymentModel;
  try {
    await payTerminal.createPay(_paymentModel!.payModelSberTerminal());
    await atolCheckService.check(_paymentModel!.checkModelAtol());
    //TODO: transaction save
  } catch (e) {
    //TODO: transaction save
  }
}