Invisible plans are not displayed in the Steady checkout or on your Steady page.
These are best used for special promotions: For example, you can offer newsletter subscribers an exclusive plan. A plan can only be purchased if a user has the link to that plan.
Activate this function in the publisher area by ticking “Hide plan” when you are editing a plan. Then you can copy the plan’s URL and use it as you wish. (In this case, the plan URL leads directly to the payment process for this plan.)