Great Plug-in, up to the point when I click the “Return to Merchant” link on Paypal. Paypal redirects to https://www.example.com/?sp_gwa_ppr=1 and the message it provides is “Void – Not Validated.”
I get this for both live and sandbox links.
Can you help me figure out why this is happening? Payment is happening on Paypal’s end (in both sandbox and live) so I think the plugin is looking for some data but it’s not seeing it come back.
Could this be the way Paypal returns IPN data? Any clues?