微信支付只能扫描支付 : https://pay.weixin.qq.com/wiki/doc/api/native.php?chapter=6_1#
支付宝支付需要申请。https://doc.open.alipay.com/docs/doc.htm?spm=a219a.7629140.0.0.h7y7x2&treeId=193&articleId=105288&docType=1
https://doc.open.alipay.com/docs/doc.htm?spm=a219a.7629140.0.0.kyhOsl&treeId=203&articleId=105286&docType=1
http://studygolang.com/articles/5636
http://blog.csdn.net/xyzhaopeng/article/details/50386349
http://blog.csdn.net/xyzhaopeng/article/details/50374191
https://github.com/ascoders/alipay/blob/master/alipay.go