It depends.
If you are ordering a FREE TRIAL, a credit card is required. You can test the product for free for however many days the trial is listed - if you don't want to continue the membership, all you have to do is cancel before the trial ends. Very easy to do - click the Cancel Academy Membership link at the bottom of every A2Z-Smart-Music.com page.
If it is a FREE PRODUCT, such as the FREE BRONZE MEMBERSHIP at A2Z Smart Music Academy, you do NOT have to provide that information. If you get stuck on a screen where it asks what type of payment (CC or PayPal), choose CC. On the following page, agree to the ClickWrap terms and click continue without entering any CC information.