Type: List population term type determines the applicable fields in this object. If left unset or set to CUSTOM_VARIABLE_TERM, then variableName, variableFriendlyName, operator, value, and negation are applicable. If set to LIST_MEMBERSHIP_TERM then remarketingListId and contains are applicable. If set to REFERRER_TERM then operator, value, and negation are applicable.
"CUSTOM_VARIABLE_TERM" "LIST_MEMBERSHIP_TERM" "REFERRER_TERM"