http://hi.baidu.com/wshe505/item/bf96b803f04c0332a3332a82
https://b.alipay.com/order/productDetail.htm?productId=2012111200373124&tabId=4#ps-tabinfo-hash
http://www.thinkphp.cn/code/240.html
http://open.tenpay.com/wiki/index.php/API%E6%8E%A5%E5%8F%A3%E6%96%87%E6%A1%A3-PHP_SDK