Configure the ResellerClub Registrar
Setting up WHMCS with domain registration is simple and increases your revenue. For this example, we will be using a free ResellerClub account.
First, navigate to Configuration > System Settings > Domain Registrars (Setup > Products/Services > Domain Registrars in WHMCS 7.10 and earlier).
Click the Activate button for ResellerClub.
The page will reload. Enter the information to authenticate with the registrar's system.
Obtaining the Reseller ID and API Key
To use the ResellerClub registrar, you must have a valid Reseller ID and API Key. If you haven't already, sign up for a ResellerClub account here.
Firstl, log in to the ResellerClub website.
Then, click on the user icon. Your Reseller Id will appear in the menu.
Next, navigate to Settings > API.
On the next screen, choose View API Key. Your API key will appear.
Copy your Reseller Id and API Key. You will need them in the next step.
Return to WHMCS and enter your ResellerID and APIKey:
After filling the appropriate boxes out, click on Save Changes.
In order to use the ResellerClub API, you must next register the server IP address for your WHMCS installation. This is a security measure that ResellerClub uses to prevent unauthorized users from submitting registration requests to your account.
In the ResellerClub control panel, navigate to Settings > API.
In the Whitelist your IP Addresses section, enter your server's IP addresses.
Click Save whitelisted IP addresses.
You can now begin using WHMCS and eNom to sell domain registrations.