Custom Fields

Having custom meta fields, could just be simple key/value pair, would be very useful. A simple example, of how it could be used. Went to a restaurant, and at bottom of receipt is a url and a code to a form I can fill out to submit a feedback survey.

This data could be saved in custom meta fields as follows:

survey_url: surveyexample.com

survey_code: 12345

If this data could be sent within the webhooks, I could automate the fill out of this form.