Warning: file_put_contents(ipn.txt): failed to open stream: Permission denied in /home/cartridgeworkspl/dev.cartridgeworksplus.com/cfx_controllers/paypalIPN.php on line 73

Warning: file_put_contents(ipn.txt): failed to open stream: Permission denied in /home/cartridgeworkspl/dev.cartridgeworksplus.com/cfx_controllers/paypalIPN.php on line 146
The response from IPN was: INVALID
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