Merge pull request #37 from Kejishe/dev

Dev
Merge pull request #38 from Kejishe/dev

Dev
Update pay.php
Update pay.php
Update pay.php
Update pay.php
Update pay.php
Update pay.php
Update pay.php
Update pay.php
Update pay.php
Update callback.php
Merge pull request #39 from Kejishe/master

Dev