+<P></P>
+<DT><STRONG><A NAME="item_default_invoicing_list">default_invoicing_list</A></STRONG><BR>
+<DD>
+Sets the invoicing list to all accounts associated with this customer.
+<P></P>
+<DT><STRONG><A NAME="item_invoicing_list_addpost">invoicing_list_addpost</A></STRONG><BR>
+<DD>
+Adds postal invoicing to this customer. If this customer is already configured
+to receive postal invoices, does nothing.
+<P></P>
+<DT><STRONG><A NAME="item_referral_cust_main_%5B_DEPTH_%5B_EXCLUDE_HASHREF_%">referral_cust_main [ DEPTH [ EXCLUDE_HASHREF ] ]</A></STRONG><BR>
+<DD>
+Returns an array of customers referred by this customer (referral_custnum set
+to this custnum). If DEPTH is given, recurses up to the given depth, returning
+customers referred by customers referred by this customer and so on, inclusive.
+The default behavior is DEPTH 1 (no recursion).
+<P></P>
+<DT><STRONG><A NAME="item_referral_cust_pkg_%5B_DEPTH_%5D">referral_cust_pkg [ DEPTH ]</A></STRONG><BR>
+<DD>
+Like referral_cust_main, except returns a flat list of all unsuspended packages
+for each customer. The number of items in this list may be useful for
+comission calculations (perhaps after a grep).
+<P></P>
+<DT><STRONG><A NAME="item_credit">credit AMOUNT, REASON</A></STRONG><BR>
+<DD>
+Applies a credit to this customer. If there is an error, returns the error,
+otherwise returns false.
+<P></P>
+<DT><STRONG><A NAME="item_charge">charge AMOUNT PKG COMMENT</A></STRONG><BR>
+<DD>
+Creates a one-time charge for this customer. If there is an error, returns
+the error, otherwise returns false.