chloerei/alipay — pull request #9 by HungYuHei (2014-05-25 09:26:40+00:00)
Title: Fix wap verify

In the previous commits, we assume that the notify_id can be accessed by `params['notify_id']`.
But actually the notify params looks like:
```
{
:service => 'alipay.wap.trade.create.direct',
:v => '1.0',
:sec_id => 'MD5',
:sign => 'signed_string'
:notify_data => "NOTIFY_IDother_value"
}
```
So we have to extract it from `params['notify_data']`