I have this error in my apache2 logs when I click on the paypal button :
[Fri Aug 20 22:26:09.741871 2021] [php7:warn] [pid 11161] [client 141.101.68.94:37644] PHP Warning: include_once(/var/www/developpement/wp-content/plugins/wcmp-paypal-checkout-gateway/classes/includes/class-wcmp-paypal-checkout-for-woocommerce-request.php): failed to open stream: No such file or directory in /var/www/developpement/wp-content/plugins/wcmp-paypal-checkout-gateway/classes/class-wcmp-paypal-checkout-for-woocommerce-gateway.php on line 180, referer: https://xxxxxxxxxxxxxxxxxxxxxxxxxxxx/checkout/
[Fri Aug 20 22:26:09.741932 2021] [php7:warn] [pid 11161] [client 141.101.68.94:37644] PHP Warning: include_once(): Failed opening '/var/www/developpement/wp-content/plugins/wcmp-paypal-checkout-gateway/classes/includes/class-wcmp-paypal-checkout-for-woocommerce-request.php' for inclusion (include_path='.:/usr/share/php') in /var/www/developpement/wp-content/plugins/wcmp-paypal-checkout-gateway/classes/class-wcmp-paypal-checkout-for-woocommerce-gateway.php on line 180, referer: https://xxxxxxxxxxxxxxxx/checkout/
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It should be easy to fix in a quick update of the plugin 🙂