To collect electronic payment information from your members upon completion of class registration, even if you are not charging them at that time, the Always require electronic payment toggle will need to be set to Yes.
From the left navigation menu, click Classes > Class Admin.
On the new page, click Settings > General.
Scroll down to the Accepted Payment Method(s) section of general settings.
Toggle the Always require electronic payment switch to the setting you would like.
Scroll down and click Save when complete.