Fatal error: Uncaught BraintreeHttp\HttpException: {"error":"invalid_client","error_description":"Client Authentication failed"} in /var/www/bob/Checkout-PHP-SDK-develop/vendor/braintree/braintreehttp/lib/BraintreeHttp/HttpClient.php:185 Stack trace: #0 /var/www/bob/Checkout-PHP-SDK-develop/vendor/braintree/braintreehttp/lib/BraintreeHttp/HttpClient.php(97): BraintreeHttp\HttpClient->parseResponse() #1 /var/www/bob/Checkout-PHP-SDK-develop/lib/PayPalCheckoutSdk/Core/AuthorizationInjector.php(37): BraintreeHttp\HttpClient->execute() #2 /var/www/bob/Checkout-PHP-SDK-develop/lib/PayPalCheckoutSdk/Core/AuthorizationInjector.php(29): PayPalCheckoutSdk\Core\AuthorizationInjector->fetchAccessToken() #3 /var/www/bob/Checkout-PHP-SDK-develop/vendor/braintree/braintreehttp/lib/BraintreeHttp/HttpClient.php(64): PayPalCheckoutSdk\Core\AuthorizationInjector->inject() #4 /var/www/bob/Checkout-PHP-SDK-develop/samples/RefundOrder.php(34): BraintreeHttp\HttpClient->execute() #5 /var/www/bob/Checkout-PHP-SDK-develop/samples/RefundOrder.php(59): Sample\RefundOrder::refundOrder() #6 {main} thrown in /var/www/bob/Checkout-PHP-SDK-develop/vendor/braintree/braintreehttp/lib/BraintreeHttp/HttpClient.php on line 185