How do paid fields get added to the cart with Magical Fields?

When you set an option as a paid field, the additional cost is automatically added to the cart whenever a customer selects that option in your online store. If you use a percentage paid field, the amount is calculated as a percentage of the current product price at the time it is added to the cart. This lets you easily charge for add-ons or extra features, and the customer will see the additional cost included in their order at checkout.