What is the ruling on taking the full profit of a store in exchange for lending to it or giving it goods for sale, and what is the ruling on a small increase over the wholesale price in case of refusal?

There is no objection to selling cards for a deferred price that is higher than their spot price. Selling on credit differs from selling for cash, and time has a share in the price. This is in accordance with the rules of Islamic law and the interests of the people. This is not considered usury as long as the commodity itself is being sold, not money. As for the merchant's statement that he will buy them for the spot price plus whatever he will earn from them, this is not permissible due to the uncertainty of the price.