Currently, only clients can become affiliates.
If you are a client, simply login to you account, click "affiliate" from the menu.

By becoming an affiliate, you will get your own referral code that you can place on your website or advertise to your friends. Whenever you refer a new client to us, your account will be credited with a commission of 20% for each payment we receive by your referral. We can pay your withdrawal by PayPal or we can add it as a Credit to your account, which can be used to pay for future invoices.

In your client area, you have the option to copy/paste a text link or a banner link that includes your affiliate link. You are free to use any type of links on your page as long as it is legal

In the client area, you will be able to see how many visitors visited your link. You can also see your sales, credits and how much you've been credited.

I want to share a bug fix in WHMCS Six template, please find attachment to see the issue. I think all the users will be experiencing same issue or may be not as may be someone fixed it. This issue appears when the right hand side contents are very less/short. I have attached a screen shot taken from whmcs.com client area hoping they're using customized Six template.

So, how to Fix?

Its simple just change line number 4 in footer.tpl

From 

Code:
<div class="col-md-3 pull-md-left sidebar">
To

Code:
<div class="col-md-3 pull-md-left sidebar" style="clear: left;">

All Licences can be reissued for free without limitations. Login into our client area and click the “Services > My Licenses” link from the client menu. Click the module for the license Details and from the products details page click the tab "Reissue" > "Reissue Licence".

Our licensing policy for a single user license allows you to install your WHMCSServices.com product on one Domain. The main understanding is that it is not used simultaneously by different people.

To unlock a second (or new) Domain, you will have to repeat the unlock process with the second domain. Note that the same unlock key will not work on both domain, as the key is made specifically for the displayed site code (unique with every installation) then you will need to pay a small fee.

...and then contact Support

We get a lot of questions about the difference between Licence and Source code versions of our modules, so we would just like to clear things up.

Both versions are exactley the same code and features, there is never a difference between features. Licence Version check our licensing system which checks the license against our database and the source code dont

The Licence version is encoded with ioncube just like WHMCS is, meaning the php files cannot be read or changed (any template files included are always open source).

The Source code version is NOT encoded with ioncube and can be installed on any number of domains provided you (your company) own (s) them. You are not allowed to sell or give away the module to others.

Both versions are also always released at the same time.

Depending on what it's for you can add it as a link in:

/templates/template_name/includes/menu.tpl for the main menu or the following for the top right toolbar:

/templates/template_name/includes/toolbar.tpl

<li><a href="{$WEB_ROOT}/index.php?m=clientverification">Add/View Verificaton Data</a></li>

Since WHMCS Services now has several active versions and also different types of updates, there are 4 types of updates. These are:

Major Release: A major release is a new main version and contains changes to the core and usually introduces new features. 1.0 and 2.0 are major releases. You can recognize one such an update also the first number of the version number changes. With Major Releases there is always only one complete upgrade and no incremental.

Minor Release: A Minor release includes new features and can also include changes to the schema and prepare major updates. The versions 2.1.0, 2.2.0 and 2.3.0 are for example Minor Releases. These updates always change the average number. With Minor Releases there is always only one complete upgrade and no incremental.

Maintenance Release: Maintenance Release is, as the name suggests, maintenance updates where bugs are fixed. The versions 1.3.1 and 1.1.2 are, for example, such updates. Here the last number always changes. There is also a small incremental update for maintenance releases.

Security Release: Security releases contain security-relevant updates which, for example, close security gaps. These updates are usually accompanied by maintenance releases and should be implemented promptly. Here again, the last number of the version number changes.

Depending on what it's for you can add it as a link in:

/templates/template_name/includes/menu.tpl for the main menu or the following for the top right toolbar:

/templates/template_name/includes/toolbar.tpl

<li><a href="{$WEB_ROOT}/index.php?m=loginverifypin">Login verify</a></li>