年以前，他致力于从专家系统、OS/2 到网络安全付费系统的软件和产品开发。
Prior to 1999, his career was focused on software and product development ranging from Expert Systems, OS/2, and Secure Internet Payment Systems.
还有就是一些平台提供了应用内置的付费和订阅机制，它们以一种一致安全的机制紧密的集成在一起。
There are also in-app payment and subscription mechanisms on offer in some platforms, and they are tightly integrated in a consistent, secure, mechanism.
付费的婚恋网站往往比免费的更安全，审核程序也更严格。
Paid services usually have more safety and screening procedures than free.
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