Tip: Add Feedback Field to Zendesk Guide with Slack notification

Zendesk Guide only has an ability to get Yes / No feedback on articles.
However, we usually would like to know a reason of Yes/No.

In the following article, I will introduce how to edit Zendesk Guide theme to allow feedback comments after entering Yes / No in order to gather actual comments from Customers. In addition, I also introduce the way to implement a postback to Slack when a feedback is entered.