White Label Customers:
Your custom header file can contain the following variables for use in display, or even for reference in your own custom scripts.
%%accountid%% will be replaced with Logged In User’s AccountID
%%teammemberid%% will be replaced with Logged In Users’ Team Member ID (Will be “0” when Account Owner/Team Leader)
%%loginemail%% will be replaced with the logged in user’s login email address (not necessarily the Mail Merge Email). This is useful as the login email address hidden once you hide the built-in header bar. TIP: You can link this to /ChangeUser.aspx if you want to allow user switching by clicking on their email address.
This update will be available in early May 2017.