下面的案例研究说明了如何使用SOA方法集成和重用现有的应用程序，以便处理信用卡支付系统的中间件操作。
The following case study illustrates how you could integrate and reuse existing applications using an SOA approach to handle the middleware operations of a credit card payment system.
在较富裕的国家，用信用卡支付是很普通的事情。这些国家的公司运行信用卡支付系统就像其他公共工程一样，长期受制于价格限额。
In rich countries, where paying by plastic is now commonplace, the firms that run card-payment systems look like other utilities, which have long been subject to price caps.
对投入了大量资金构建品牌的信用卡公司及银行而言，他们并不希望看到其他支付系统发展壮大。
Having spent fortunes on branding, credit-card firms and Banks do not want to see other payment systems gain ground.
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