1. If you use All Page Option:
When registering a new account (without placing an order), WHMCS would normally allow the customer to do anything even without verifying their email address. With our module, after registration, they will be redirected to the page where they will have to verify their email.
If the customer doesn't verify they CAN NOT access any part of their account (except Support Tickets and client detail) until they have verified their email address.
If they do not verify their email address within X days, then their account will automatically be closed. Admin can also manual mark the email verification.
As part of WHMCS's standard procedure when a new customer orders a product/service then they will be asked to register before making the payment.
After they have registered, they will be asked to verify their email address before proceeding to make payment (Credit Card Only).
Once they have successfully verified their email address then they will be able to proceed to payment - and only then.
2. It uses Checkout Option then they need to verify they email before they place an order and it will not store in the Database until they verify the email. If they don't verify then they can not place an order.
This module helps to stop many fraud emails but allows legitimate emails.
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- More info: https://www.whmcsservices.com/emailverification.php