Fatal error: Uncaught Error: Call to undefined function add_action() in /home/adaptyo3/public_html/wp-content/plugins/QUARENTINE/woocommerce-subscriptions/classes/gateways/gateway-paypal-standard-subscriptions.php:20 Stack trace: #0 {main} thrown in /home/adaptyo3/public_html/wp-content/plugins/QUARENTINE/woocommerce-subscriptions/classes/gateways/gateway-paypal-standard-subscriptions.php on line 20