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报错
There was a problem communicating with the PayPal servers. Please try again
解决
先去paypal下载了官方demo，出现同样问题。百度、谷歌都没发现解决方案。其实代码没问题。检查发现是自己开了网络代理，但是代理设置有问题，连百度都打不开。修复网络后，支付成功。
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