Warning: Undefined array key "HTTP_STRIPE_SIGNATURE" in /home/blackgrizn/www/stripe-webhook.php on line 16

Fatal error: Uncaught TypeError: array_keys(): Argument #1 ($array) must be of type array, null given in /home/blackgrizn/www/vendor/stripe/stripe-php/lib/StripeObject.php:305 Stack trace: #0 /home/blackgrizn/www/vendor/stripe/stripe-php/lib/StripeObject.php(305): array_keys(NULL) #1 /home/blackgrizn/www/vendor/stripe/stripe-php/lib/StripeObject.php(276): Stripe\StripeObject->refreshFrom(NULL, NULL, false, 'v1') #2 /home/blackgrizn/www/stripe-webhook.php(22): Stripe\StripeObject::constructFrom(NULL) #3 {main} thrown in /home/blackgrizn/www/vendor/stripe/stripe-php/lib/StripeObject.php on line 305