+=item referral_cust_pkg [ DEPTH ]
+
+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).
+
+=cut
+
+sub referral_cust_pkg {
+ my $self = shift;
+ my $depth = @_ ? shift : 1;
+
+ map { $_->unsuspended_pkgs }
+ grep { $_->unsuspended_pkgs }
+ $self->referral_cust_main($depth);
+}
+
+=item credit AMOUNT, REASON
+
+Applies a credit to this customer. If there is an error, returns the error,
+otherwise returns false.
+
+=cut
+
+sub credit {
+ my( $self, $amount, $reason ) = @_;
+ my $cust_credit = new FS::cust_credit {
+ 'custnum' => $self->custnum,
+ 'amount' => $amount,
+ 'reason' => $reason,
+ };
+ $cust_credit->insert;
+}
+