+=item cust_credit
+
+Returns all the credits (see L<FS::cust_credit>) for this customer.
+
+=cut
+
+sub cust_credit {
+ my $self = shift;
+ sort { $a->_date <=> $b->_date }
+ qsearch( 'cust_credit', { 'custnum' => $self->custnum } )
+}
+
+=item cust_pay
+
+Returns all the payments (see L<FS::cust_pay>) for this customer.
+
+=cut
+
+sub cust_pay {
+ my $self = shift;
+ sort { $a->_date <=> $b->_date }
+ qsearch( 'cust_pay', { 'custnum' => $self->custnum } )
+}
+
+=item cust_refund
+
+Returns all the refunds (see L<FS::cust_refund>) for this customer.
+
+=cut
+
+sub cust_refund {
+ my $self = shift;
+ sort { $a->_date <=> $b->_date }
+ qsearch( 'cust_refund', { 'custnum' => $self->custnum } )
+}
+
+=item select_for_update
+
+Selects this record with the SQL "FOR UPDATE" command. This can be useful as
+a mutex.
+
+=cut
+
+sub select_for_update {
+ my $self = shift;
+ qsearch('cust_main', { 'custnum' => $self->custnum }, '*', 'FOR UPDATE' );
+}
+