Add wap pay token and url
Add Alipay::Sign::Wap.verify?
Add Alipay::Notify::Wap.verify?
Generate sec_id in Alipay::Service::Wap.query_string
Manually generate xml
Update README
Alipay::Service::Wap.trade_create_direct_token return token directly
Update README
Merge pull request #8 from HungYuHei/wap-pay

Wap pay