Written by Ogy Nikolic
Advantages:
- most online shoppers feel better about a site when they see these Joomla security symbols.
- external scanning completed does protect against some common website threats.
Disadvantages:
- additional costs
- may create a false sense of Joomla security for you because only external scanning is employed. We've seen plenty of Joomla sites passing these external Joomla security scans but were outdated and contained known security holes.
Overall, I could recommend starting with
- authorize.net or paypal symbol available for free.
- SSL certificate symbols are typically available for free
- clear website security policy where your Joomla development team will recommended a draft for your review.
- clear return policy, terms of service, phone and mailing address easily found on the site
If the trust becomes an issue, further improvements could be needed but the above 4 items should be more than enough for the initial site release. Related to your own liability, it's greatly reduced if you don't have credit card information stored on the website.