In the Omnichannel Widget Settings in Inbox, you can define the specific website domains, for example,  www.messagebird.com or www.developers.messagebird.com, where your widget can and will be displayed. This is known as domain whitelisting. 

You can also choose to leave this field blank. This means your widget could be displayed on any website domain as there will be no domain whitelisting.

We recommend whitelisting your website domains as a security precaution.