Hi. We received an email from paypal yesterday informing us that some paypal ipn's processed by CBSubs are failing - please see the email below. We are using Joomla 3.3.3, CB 1.9.1, CBSubs 3.0.0. Most of the CBSubs transactions are processed successfully. I have also attached: a transaction record from paypal for one of the failing ipn's; a screenshot of the CBSubs Basket screen; and a screenshot of the CBSubs Notifications screen.
Can you please provide some advice/recommendations for how to debug this? Thanks!