Are you getting the error when Przelewy24 sends a status request to your server? You can also dump the whole request in the controller to see what was sent to you.

Issue When I login to my recently installed SuiteCRM 8 instance, I get a ton of "Undefined array key" errors in my PHP-FPM log coming from templates. Expected Behavior No PHP errors are given on lo ...

$ _POST or $ _GET are two special PHP functions that are used to get variables from a user-filled form. While using these functions, a user may encounter an error, stating that there is an undefined ...