Edición
Al intentar acceder a la URL de notificación, aparece un error 403 Forbidden y en la página Historial de IPN de PayPal se muestra lo siguiente Reintento - en lugar de Enviado o Fallido.
Solución
If the IPN shows up in the IPN History list as “Retrying” then this means that communication is being blocked by the server and causing confusion in MemberMouse. You’ll want to reach out to your hosting provider to understand why IPNs from PayPal are being blocked, and to have them make your IPN accessible to all web traffic. Verify that there are no security settings on the server preventing access to the IPN file. This will help to insure proper communication flow between MemberMouse and PayPal.

