The World of Wishes - The World of Wishes, #1

Anything you wish is yours. Anything. From flying cars to floating islands, from purses to personal slaves, anything is legal to buy and sell in the World of Wishes--just swipe your Card and it's yours. Just be sure to pay your bills... Isaac Jackson is a revolutionary against the tyrannical Black Sorceress, little knowing it's all a game for the rich. Clarissa Hardcastle, employee of the Black Sorceress, is the wayward scion of a ultrawealthy family.
Thrown together by the destruction of their fantasy world by a colossal robotic Collector, they must struggle to survive in the World of Wishes, where money is everything and everything is for sale. Clarissa's new life is thrown into chaos when one of her friends is forced to sign a slavery contract. Together with Isaac and Erik, a young soldier, Clarissa must fight against the whole might of the World of Wishes.
After all, there are no laws, only contracts freely signed. And no mercy for those who break them.