"Production domains"-setting is a list of domains, where Videoly’s widget is active (assuming, that Videoly’s tag is installed on these domains). If our widget needs to be visible in development or testing environment, you can just simply add your domain name in this list. 

Manipulation with domains affects statistics. In A/B (conversions with visible widget vs. conversions with hidden widget) and Z/W (conversions with watched videos vs. conversions with non-watched videos) reports different numbers can appear, because they are counted only for the domains, mentioned in the list.

We are restricting our widget to work only on certain domains because thus we avoid traffic from unwanted referrers. It is possible, however, test our widget on any page with our tag, simply adding to the url “?vdly-preview=1”. More information about hostname protection can be found on this page