Fatal error: Uncaught TypeError: array_key_exists(): Argument #2 ($array) must be of type array, null given in /var/www/html/RK_batchApi/staging/Common.Function.php:19 Stack trace: #0 /var/www/html/RK_batchApi/staging/index.php(29): Common->validateApiRequest() #1 {main} thrown in /var/www/html/RK_batchApi/staging/Common.Function.php on line 19