We designed a Bootstrap website with a one-time purchase option using PayPal and the IPN responds quickly with no problem. Then, we have another Bootstrap website that uses a recurring subscription and the IPN is always delayed. We also developed 2 other recurring subscription based Drupal websites using the 'PayPal Roles' module and the IPN is always delayed on those as well. When the customer/user is returned to our website after completing payment, our confirmation page returns a "You are not authorized to view this page..." error because the IPN is delayed and has not been received. Usually, if we wait about 5-10 seconds and refresh the page, the IPN catches up, updates the database, the error goes away, and the user is able to access our website. On the PayPal Developer website, I read that the IPN is not a real-time solution, but there does not seem to be a solution offered to work around this issue. So what is the best solution to work around the IPN delay?
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