Fatal error: Uncaught Error: Class "AmazonPay\IpnHandler" not found in /home/airtimer/public_html/vendor/amzn/amazon-pay-module/Ipn/IpnHandler.php:28 Stack trace: #0 {main} thrown in /home/airtimer/public_html/vendor/amzn/amazon-pay-module/Ipn/IpnHandler.php on line 28