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When you buy (or, more formally, purchase) something in a shop, you usually pay for it outright but sometimes you buy on credit.
Sometimes, you may be offered a discount or a reduction on something you buy at a shop. It is not usual to haggle about prices in a British shop, as it is in a Turkish market. If you want to return something which you have bought to a shop, you may be given a refund, i.e. your money will be returned, provided you have a receipt. The money that you pay for services, e.g. to a school or a lawyer, is usually called a fee or fees; the money paid for a journey is a fare. If you buy something that you feel was very good value, it’s a bargain.
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What is a fee?