Yes, they do. This procedure is available starting with our Professional plan. Once you setup up your subdomain , all you need to do is to contact us. Specify which subdomain you would like to use on your forms.
After the procedure is done on our side, you will receive a CNAME record. Set up your subdomain to point to that CNAME record in order to establish the connection.
Finally, go to your form’s Publish section – Get link – Connection Type, tick on Secured SSL and add your subdomain.
The SSL certificate is provided by us. This is offered free of charge to all Professional users who need their own subdomain.