He we are installing this today and have run into a bunch of issues.
1. when logging into whmcs client area as a user, it does not take me to the user's account. instead get 404 page. not sure where it is trying to redirect to
2. the domain checker we use on the wp page cannot use the integration code with whmcs to work directly on domain searches
3. get error on bottom of page where it should be showing tweets "WHMCS Integration: A valid URL was not provided." but it should work as the portal is using the same URL