Within CCV Shop it is possible to set a main domain. This is also important if you only have 1 domain. You can set this main domain at "Starting point > My Webshop > Settings > General > Domains". Select the main domain, and click "Apply".
The setting of the main domain ensures that all other domains with a so-called "301 Redirect" are referred to the main domain. Referrals ensure that search engines only index this domain, which can benefit search engine search results.
Please note! The main domain must be working. Example: When jansen.ccvshop.nl refers to www.jansen.nl, but it does not work, the customer will not see a web store.