You automatically get a 3-day free trial of the Growth membership when you sign up, with no card required. If it isn't the right fit, do nothing: at the end of the trial your account moves to the Free plan and you aren't charged.
When the trial ends without a paid plan, any products you published are automatically unpublished from your store. Your selections aren't lost; they stay saved in your account. To restore them: subscribe to a paid plan, go to My Products, and toggle Publish to Store back on. On the Free plan you can still browse the catalog and place sample orders.
New members: completing the onboarding tasks can earn bonus AI credits.