Email Verification For WHMCS allows you to enforce the clients to verify their email address after registering.
The module will force redirect all URLs in your client area to the verification pages if they didn't complete the email verifications. Our module works well with WHMCS built-in email verification functions.
By enabling the "Skip shopping cart" option, our module will not ask for verification after they complete the payment; which reduced the interruption for new clients placing an order.
A well-designed and secure way to change email addresses reduces the possibility of accidental account loss or malicious account theft.
This helps you to disable registration when you don't want to accept more new clients.