The CC-required-for-trial thing is a form of 'negative option billing' and, IMO, it would be best not to do it. Many companies have stopped (a high profile exam

The CC-required-for-trial thing is a form of 'negative option billing' and, IMO, it would be best not to do it. Many companies have stopped (a high profile example: 37signals no longer requires credit cards to signup for Basecamp). Braintree has a good article on it [1]. In that article are some recommendations for when you must do negative option billing - one of which is to send them a warning 5 days before billing. [1]: https://www.braintreepayments.com/blog/negative-option https://www.braintreepayments.com/blog/negative-option