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1.安装United States Postal Service
2.登录https://registration.shippingapis.com/,注册帐号,稍后会收到邮件
3.打开邮件,记下User ID (Username)
4.配置下面内容
opencart配置United States Postal Service快递
原文地址:http://www.cnblogs.com/chixiaobai/p/5583720.html