Fatal error: Uncaught Error: Class "BTCPayServer\Client\AbstractClient" not found in /home/mydemotec/public_html/frun/vendor/btcpayserver/btcpayserver-greenfield-php/src/Client/Miscellaneous.php:12 Stack trace: #0 {main} thrown in /home/mydemotec/public_html/frun/vendor/btcpayserver/btcpayserver-greenfield-php/src/Client/Miscellaneous.php on line 12