Warning: Undefined array key "vat" in /var/www/api.cui.info.pl/html/functions.php on line 54

Fatal error: Uncaught TypeError: checkVatEu(): Argument #1 ($vatId) must be of type string, null given, called in /var/www/api.cui.info.pl/html/functions.php on line 54 and defined in /var/www/api.cui.info.pl/html/functions.php:3 Stack trace: #0 /var/www/api.cui.info.pl/html/functions.php(54): checkVatEu() #1 {main} thrown in /var/www/api.cui.info.pl/html/functions.php on line 3