• Includes PR #253 (thanks @attie).
• If you do not wish to merge the POST data into the params (for example if you are using a webhook that provides other data as JSON), then you can add &post_data=1 to the query string. If you do this, then the POST data will be available in the post_data key of the params object.
• Thanks to user @attie and PR #254 for these fixes and suggestions.