how to change webview payment to open in browser in flutter

Question

I want the payment process to be done in the phone browser. But now this operation is done according to the following code in webview. Please help to replace the current mode. this code:

  /// Navigate to Webview payment
  String? orderNum;
  await FluxNavigate.push(
    MaterialPageRoute(
        builder: (context) => PaymentWebview(
              url: url,
              onFinish: (number) async {
                orderNum = number;
              },
            )),
    forceRootNavigator: true,
  );
  if (orderNum != null) {
    cartModel.clearCart();
    await Navigator.push(
      context,
      MaterialPageRoute(
          builder: (context) => WebviewCheckoutSuccessScreen(
                order: Order(number: orderNum),
              )),
    );
  }
  return;
}

/// return success to navigate to Native payment
success!();

}