为此你必须:
1. go to sandbox.paypal.com 2. log in using one of your testing accounts 3. Under profile select "My Selling tools" 4. In "Website preferences" click "update" 5. Here you can set the Return URL
(这可能是您登录后访问的URL: https://www.sandbox.paypal.com/cgi-bin/customerprofileweb?cmd=_profile-website-payments
对于真实账户来说基本上是相同的过程。