Fields to return in the results; 'id' is always returned. Available fields are 'id', 'assigned_to_agent_id', 'transaction_id', 'completed_ts', 'created_ts', 'description', 'due_date', 'due_status', 'due_label', 'due_trigger', 'name', 'notes', 'pinned_on_boards', 'status_id', 'status', 'task_list_id', 'task_blueprint_id', 'task_type', 'team_id', 'updated_ts', 'address_1', 'address_2', 'city', 'state', 'postal_code', 'transaction_stage', 'transaction_first_name', 'transaction_last_name', 'lost_date', 'transaction_type', 'tc_agent_id', 'transaction_tags', 'transaction_status', 'assigned_to_agent_first_name', 'assigned_to_agent_last_name', 'assigned_to_agent_profile_path', 'on_roadmap', 'comment_count', 'task_list_order', 'doc_id', 'doc_type_id', 'doc_type_label', 'recipients'