Hi, Recently, there has been more and more occurances of transactions completed by paypal, but that do not finalize on our site. Our code has been unchanged for a long time, it just started happening recently, and at this point we are clueless as to how to resolve this important issue. We have to refund people that pay twice, thinking it was an error on their part, among other things. Would someone know what could be causing this and how we could resolve it? I've seen this post but no answer yet: http://stackoverflow.com/questions/24110931/patpla-ipn-returns-403-on-getresponse Any help would be appreciated,
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