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Redirect to sandbox.paypal.com/webapps/hermes/erro... - PayPal Community
PayPal Sandbox User Guide | Manualzz
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Wrong amount passing to PayPal | Bagisto Forum
Creating a basic PayPal Shopping Cart
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Simple Html Paypal Integration Form
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![Paypal Sandbox not redirecting on successful purchase [#2150533] | Drupal.org](https://www.drupal.org/files/issues/commerce_paypal-2013-12-05-14-51-38.png "Paypal Sandbox not redirecting on successful purchase [#2150533] | Drupal.org")