You normally receive this message in the following format:
{
success: false,
data: "",
msg: "You don't have permission to use this specific webhook action."
}
It means, that you limited the used webhook URL to only allow certain actions, and the ones you try to call are not whitelisted.
How to fix the issue
Please head over to the Receive Data tab of the plugin and click on the Settings link of the webhook URL that you use.
Once there, you will find a settings item called Whitelist only specific actions. There you need to add the action you want to allow. If you want to allow all webhooks, simply deselect all.
