Active.Com is one of the more frequently used online payment processing options for sporting event registration - fun runs, triathlons, etc. Two years in a row, one of my event registrations has automatically signed me up for a Plus membership ($59.95 / year) which I did NOT agree to. Last year I called and reported this, was assured by phone support that the charge would be reversed. It was not - so I stopped paymen through my credit card company. This year - SAME thing - I see a charge from them that I HAVE NOT authorized show up on my credit card statement.
This company has created a deceptive opt out user interface that - based on the number of complaints I see on their own user online user community - has caused hundreds of complaints from unwitting consumers who simply want to sign up for a $20 fun run. If they were not the only registration option - I would never use them. Deceptive at best, fradulent at worst.