Duplicate API Cancellation Notification

[toddz88]

When a member CANCELS, Paypal seems to send 2 different IPNs, about 20 seconds apart, which I see in my log (paypal-ipn.log) as:
- subscr_cancel
- recurring_payment_profile_cancel

They BOTH trigger the s2m API Cancellations Notification, for which I have some php that sends an email to the site owner, who therefore gets two (nearly) identical emails when a member cancels.

The IPN log shows that s2m is aware of the duplication:

Code: Select all

4 => 'Ignoring Cancellation. An Auto-EOT Time is already set for this Member. An s2Member API Notification will still be processed however.',
5 => 'Cancellation Notification URLs have been processed.',

How can I PREVENT one of the API Notifications from being processed, or somehow distinguish between the two different IPNs, so that my routine runs only once?

[Jason Caldwell]

Thanks for reporting this.
Yea, PayPal is known to do that every once in awhile.

In your script that handles your custom routine, I would take the %%subscr_id%% value and write a temporary file to disk. On the second Notification, check for the existence of that temporary file. If it exists, don't process it again.