Arcadier provides a https://yourmarketplace.arcadier.io domain to all marketplaces that sign up on Arcadier. This SSL coverage (https:// instead of http://) provides encryption security for all the default URLs for admins so that they can start being transactional.
If you would like to switch to your custom domain, you can do so using the custom domain tool. To find out more, follow the link below.
https://support.arcadier.com/hc/en-us/articles/115001757613-Linking-your-custom-domain-to-Arcadier
To cover your custom domain with an SSL certificate, you can do so as well. To find out more, follow the link below.
https://support.arcadier.com/hc/en-us/articles/115001757653-Adding-an-SSL-certificate