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protected $thisTemplate is wrong. Should be protected $_sThisTemplate.
This caused IPN-Handler to spam warnings in apaches error.log:
[Thu Feb 07 15:10:47.010789 2019] [php7:warn] [pid 4446] [client XXX] PHP Warning: Smarty error: unable to read resource: "" in XXX/vendor/smarty/smarty/libs/Smarty.class.php on line 1100