Paypal IPN Authentication Failed
 

I've setup paid subscriptions on my forum using VBulletin 3.8.5 using the guide posted here.

http://www.vbulletin.com/forum/showt...k-these-things.

I was able to go through the checkout and noticed the payment was completed on paypals end. My notification URL is

http://www.wptavern.com/forum/paymen...?method=paypal with IPN enabled.

The IPN history page shows the transaction that occurred but the status is FAILED. Inside of the log file for Vbulletin, it also says failed.

vb_error_code authentication_failure

I'm at a lost as to what to do now.