Configure the Extensions or TLDs You Want to Offer
Configuring the domain extensions, or TLDs (Top Level Domains), you wish to sell is really easy with WHMCS.
First, navigate to Configuration > System Settings > Domain Pricing (Setup > Products/Services > Domain Pricing in WHMCS 7.10 and earlier):
Enter the new TLD or extension that you want to add in the last row in the TLD list. For this example, we will be adding the .co extensionusing the Enom registrar module to automatically set up domains, so we have chosen this from the dropdown.
After selecting any desired options, choose Save Changes.
Now, set the pricing for this TLD or extension by clicking Open Pricing to the right.
On the window that pops up, check Enable for any pricing intervals you wish to set. In our case, we will be specifying pricing for 1, 2, and 3 year terms.
Fill out your desired pricing and click Save Changes.
That's it! Your WHMCS is now setup to sell the TLD or extension you just set up!
For more information on domain pricing, see Domain Pricing.