What I did :
on page /wp-admin/admin.php?page=slack-notifications-general
I saved an empty url for the webhook url (I wanted to inactivate the notifications) : the plugin raise an internal Server Error that is not catched resulting in blocking every payment checkout.
What I did : on page /wp-admin/admin.php?page=slack-notifications-general I saved an empty url for the webhook url (I wanted to inactivate the notifications) : the plugin raise an internal Server Error that is not catched resulting in blocking every payment checkout.
debug.log :