Each campaign booking is linked to the dedicated chat, so that all campaign participants (influencers, brands and agencies) can discuss all the details inside the system. 

If the application to the campaign was done by the agency the influencer can communicate with the agency as well as with the brand in separate chats. There is a chat icon near each booking clicking on each leads you to chats with agency and brand.

In the booking was done by the independent influencer and not connected to any agncy then the chat in available over 3 vertical dots > Send message.

Each user has INBOX page that contains all the conversations and unread messages counter. It is accessible via dashboard after you login with your credentials. There is also text search in place to make it easier to find an appropriate conversation.

Also you can track all system notifications in notification hub allocated on the top of the page. This allow you to be informed right away about invitations, application acceptance etc.