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我已经阅读了启用自动退货的信息，我必须在 www.paypal.com 上启用此功能 - 但是如何在沙盒模式下启用自动退货？
您只需要在发布到 PayPal 时提供returnurl 和url。cancel_return
return
cancel_return
变量的更多细节在这里