The only other step is to contact (by phone, or E-mail, or in some cases, paper documentation) the developers who use your code if you don't build a customer-facing component.

如果没有创建一个面向用户的组件，下一步是联系(通过电话或电子邮件、或是书面文档)使用您的代码的开发人员。

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The "two-factor" verification system, which will be optional, asks users to register a phone number, e-mail account and six-digit code that would have to be entered, via text message, each time they log in to the site.

CNN: Twitter bumps up log-in security after hacks