How to Enable PayPal Instant Payment Notification (IPN) - CodexWorld
php - PayPal sandbox differs from Live mode - Stack Overflow
![Paypal Sandbox not redirecting on successful purchase [#2150533] | Drupal.org](https://www.drupal.org/files/issues/commerce_paypal-2013-12-05-15-44-02.png "Paypal Sandbox not redirecting on successful purchase [#2150533] | Drupal.org")
Paypal Sandbox not redirecting on successful purchase [#2150533] | Drupal.org
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php - PayPal sandbox differs from Live mode - Stack Overflow
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Forums - Using paypal example and paypal setup
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php - Paypal IPN not responding at all - Stack Overflow
![Invalid notify_url [#1055390] | Drupal.org](https://www.drupal.org/files/issues/pp_0.jpg "Invalid notify_url [#1055390] | Drupal.org")
Invalid notify_url [#1055390] | Drupal.org
