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PayPal invalid handshake after upgrading to 7.2.2 - Help!


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Since upgrading this morning to v7.2.2 the PayPal IPN is not working and showing a 406 error

 

WHMCS Gateway logs show 'IPN Handshake Invalid'

 

I have checked all setting and ensured charset is set to UTF-8

 

Can anyone help?

 

Thanks

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