Step::1 Login to your WHMCS.
Step::2 Go to the Clients section and click on View/Search Clients.
Step::3 Select the Client from the list.
Step::4 Now go on the Other Action panel and search for “Export Clients Data” option and proceed.
Step::5 Now click on Generate and Download Export.
That's It !Check out the video tutorial to get detailed explanation on the topic. You may read the blog as well.