Start access
Access 3rdsystem
Pass?
Verify
Process the request
外部系统（或Polar）
Create signature
End Request
Responseresult
Polar（或外部系统）
No:Refuse request
Polar与外部系统集成
Yes: Pass
AppID &AppKey
Start Request
Verify MD5 by request JSON and AppKey by AppID
OfflineDistribute
Distribute AppID & AppKey
AppID & AppKey
Request Json & MD5(Signature) & AppID to 3rd
Create MD5by Reqeust Json and AppKey
