Step::1 Log into your WHMCS.
Step::2 Hover over the Setup and Payments options and click on Payment Gateways.
Step::3 Select the All Payment Gateways tab.
Step::4 Select CC Avenue payment gateway.
Step::5 A configuration page will appear.
Step::6 Click on Save to update the changes.
That's It !
You may check out the video tutorial and read the blog to get the procedure in detail.