Drupal - latest version CiviCRM - 4.7.13
We have a client that uses PayPal standard with recurring payments that having an issue that I can't figure out. The recurring payments seem to have quit working since the first of the year. By quit I mean they are logged but after that nothing seems to happen. No errors and no record of the payment. I have used a test setup where I use curl to resend messages to my local environment while in debug mode but it doesn't work (it does work for authorize.net payments). In this case it seems like the data isn't there when the message is to be processed.
Another interesting thing is that some of the IPNs look like they are resent several times within a few mins. They have the same transaction ID, etc.
Any help or ideas are very much appreciated.