我正在构建一个flutter网络应用程序，它必须能够在特定的WhatsApp业务号码和WhatsApp号码上发送消息。我到底应该怎么做？如果用户的设备有WhatsApp或WhatsApp业务，他就会打开它。但我的问题是，如果用户的设备同时有WhatsApp和WhatsApp业务，我希望在一个条件下打开一个。

var whatsappURlAndroid = "https://wa.me/$whatsappNumber/?text=Hi";
var whatappURLIos ="https://wa.me/$whatsappNumber?text=${Uri.parse("hello")}";
var webWhatsapp= "https://web.whatsapp.com/send?phone=$whatsappNumber&text=Hello";

if (defaultTargetPlatform == TargetPlatform.iOS) {
  await launch(whatappURLIos, forceSafariVC: false);
}else if(defaultTargetPlatform == TargetPlatform.android){
  await launch(whatsappURlAndroid);
}
else{
  await launch(webWhatsapp);
}