optize Posted December 3, 2014 Share Posted December 3, 2014 We made the mistake of upgrading to 5.3.10 to make WHMCS support happy on another unrelated bug. Since then, it's opened up about 20 more bugs, however this one is a bit critical. We're seeing tons of IPN Handshake Invalid errors since upgrading. They told me to manually force the charset in our PayPal profile, which is set. The invalid IPN headers even show the charset we forced so we know that's not the issue. Has anyone else ran into this? 0 Quote Link to comment Share on other sites More sharing options...
WHMCS Support Manager WHMCS John Posted December 4, 2014 WHMCS Support Manager Share Posted December 4, 2014 Hi, What do you see in the Debug Data of the Billing > Gateway Log please? Be sure to blank out any sensitive information before posting it publicly here. 0 Quote Link to comment Share on other sites More sharing options...
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