Yes. A refund for an SSL certificate can be requested within 5 days after certificate issuance. If a cancellation request is submitted when the 5-day grace period is over, the refund will not be granted.
Certificates which have been purchased but yet to be issued can be canceled and refunded only if you request for cancellation within 30 days from the purchase date. To make a request, send an email to billing@whogohost.com or you can open a ticket via this link stating the domain name and invoice number used to purchase the SSL Certificate.
Note: The cancellation request which exceeds a 30 day period from the purchase date will not be fulfilled. This applies to both Comodo and Certum.