Webhook POST from external service?

Webhook POST from external service?

I have the requirement to integrate with multiple external services. It seems reasonable to have the ability to accept and manipulate a JSON or XML payload in the body of the webhook HTTP request, however, it seems that this capability doesn't exist in Creator. I've scoured the help facility as well as these forums for a definitive guide and have found nothing. I have contacted live chat support as well.  They keep pointing me to the Creator API documentation which assumes that I can configure the webhook POST to include the data I want to receive.  This is impossible as the external services dictate the contents of the request payload.  If I could simply populate a text field/multi-line text field with the raw body of the request, I can then load the contents into the appropriate deluge variable to enable extraction of individual data elements.

I am hoping someone has been down this road and has figured out how to receive webhook posts from 3rd party services.