Download WHMCS module for CWP from our site
http://dl1.centos-webpanel.com/files/3rdparty/whmcs/cwp7.zip

1. Extract file cwp7.zip in your whmcs folder
WHMCS/modules/servers/

as extracted module file path will look like this
WHMCS/modules/servers/cwp7/cwp7.php

2. In WHMCS
In Menu goto: Setup -> Products/Services -> Servers
Add New Server and under “Server Details”
Type = Cwp7
Username: root
Password: (your server password)
Access Hash: copy your key from CWP API

3. Generate API Key on the CWP server
goto Left-Menu -> CWP Settings -> API Manager
Use the following permissions:
-add, edit, suspend, unsuspend and delete accounts
-edit packages
-change Password

That is it, now you can create CWP accounts from WHMCS.

Video instructions for CWP