+=item default_invoicing_list
+
+Returns the email addresses of any
+
+=cut
+
+sub default_invoicing_list {
+ my $self = shift;
+ my @list = ();
+ foreach my $cust_pkg ( $self->all_pkgs ) {
+ my @cust_svc = qsearch('cust_svc', { 'pkgnum' => $cust_pkg->pkgnum } );
+ my @svc_acct =
+ map { qsearchs('svc_acct', { 'svcnum' => $_->svcnum } ) }
+ grep { qsearchs('svc_acct', { 'svcnum' => $_->svcnum } ) }
+ @cust_svc;
+ push @list, map { $_->email } @svc_acct;
+ }
+ $self->invoicing_list(\@list);
+}
+
+=item referral_cust_main [ DEPTH [ EXCLUDE_HASHREF ] ]
+
+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).
+
+=cut
+
+sub referral_cust_main {
+ my $self = shift;
+ my $depth = @_ ? shift : 1;
+ my $exclude = @_ ? shift : {};
+
+ my @cust_main =
+ map { $exclude->{$_->custnum}++; $_; }
+ grep { ! $exclude->{ $_->custnum } }
+ qsearch( 'cust_main', { 'referral_custnum' => $self->custnum } );
+
+ if ( $depth > 1 ) {
+ push @cust_main,
+ map { $_->referral_cust_main($depth-1, $exclude) }
+ @cust_main;
+ }
+
+ @cust_main;
+}
+
+=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;
+}
+
+=item charge AMOUNT PKG COMMENT
+
+Creates a one-time charge for this customer. If there is an error, returns
+the error, otherwise returns false.
+
+=cut
+
+sub charge {
+ my ( $self, $amount, $pkg, $comment ) = @_;
+
+ my $part_pkg = new FS::part_pkg ( {
+ 'pkg' => $pkg || 'One-time charge',
+ 'comment' => $comment,
+ 'setup' => $amount,
+ 'freq' => 0,
+ 'recur' => '0',
+ 'disabled' => 'Y',
+ } );
+
+ $part_pkg->insert;
+
+}
+