调用支付方法很简单，但想成功并不简单：
payWithWeChat(
appId: result['appid'],
partnerId: result['partnerid'],
prepayId: result['prepayid'],
packageValue: result['package'],
nonceStr: result['noncestr'],
timeStamp: result['timestamp'],
sign: result['sign'],
);更多信息还查看支付文档吧.