noun
Neutral term for a person who buys something, often used in commercial or legal contexts.
この商品の購入者には特典が付きます。
Purchasers of this product will receive a bonus.
買い手 is a more general 'buyer' in a transaction, while 購入者 is slightly more formal and often used in business or legal settings.
Compound of 購入 (purchase) + 者 (person).