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How to unify Tracking ID prefix

If you use the same Publisher ID on several WordPress installs (separate domains, subdomains, subdirectories) you have to use a unique tracking prefix for each site.
Add in functions.php file of your theme:
function my_cbtrkr_subid_prefix()
return 'yourprefix';
add_filter('cbtrkr_subid_prefix', 'my_cbtrkr_subid_prefix');
Please use only letters (a-z) for a new prefix.