PAYGENT for WooCommerce <= 2.4.6 - Missing Authorization to Unauthenticated Payment Callback Manipulation

The PAYGENT for WooCommerce plugin for WordPress is vulnerable to Missing Authorization in all versions up to, and including, 2.4.6. This is due to missing authorization checks on the paygent_check_webhook function combined with the paygent_permission_callback function unconditionally returning true on line 199. This makes it possible for unauthenticated attackers to manipulate payment callbacks and modify order statuses by sending forged payment notifications via the `/wp-json/paygent/v1/check/` endpoint.