add session model
add session admin
client added
minor change
minor change
set up dh key exchange
add key field
change key to char
fix date time
encryption work
orgnize encryption
session work
fix bug and orgnized
add balance to client
request service server side
client request balance
minor fix
pay previous order
request refund
Merge pull request #51 from qysnolan/issue_50_com_with_app

Issue 50 com with app