Fatal error: Uncaught InvalidArgumentException: You did not provide any data in /var/www/medgabinet/vendor/pay-now/paynow-php-sdk/src/Paynow/Util/SignatureCalculator.php:74 Stack trace: #0 /var/www/medgabinet/inc/modules/med-gabinet/controllers/class-med-gabinet-visit-controller.php(1743): Paynow\Util\SignatureCalculator::generate() #1 [internal function]: HP\Modules\Med_Gabinet\Med_Gabinet_Visit_Controller::handlePaynowWebhook() #2 /var/www/medgabinet/inc/core/controllers/class-routing-controller.php(55): call_user_func_array() #3 /var/www/medgabinet/inc/load.php(23): HP\Routing_Controller::handleRequest() #4 /var/www/medgabinet/public/index.php(6): require('...') #5 {main} thrown in /var/www/medgabinet/vendor/pay-now/paynow-php-sdk/src/Paynow/Util/SignatureCalculator.php on line 74