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