Our store recently changed to a new acquirer, which charges much lower fees than before.

acquirer 是动词 acquire（获得、取得）加后缀 -er 构成的名词，表示"获取者"或"收购方"。 在金融领域特指"收单行"，即负责处理商户信用卡交易的金融机构，它们"获取"商户的交易信息并代为结算。