If you are transitioning from a previous version, the following notes will be helpful.

ID → Class name

V3 used the ID name #vs-wineclub-signup to define the element, which causes conflicts with multiple instances of a cart. This was changed to the class name .vs-club-registration so more than one instance may be displayed.

No CSS injection

Previously the cards settings was based on injecting a complete CSS file reference. Please refer to Styling for more information.