+ my ($class, $start, $end) = @_;
+ my $credit_start = $start ? "AND cust_credit_refund._date <= $start" : '';
+ my $credit_end = $end ? "AND cust_credit_refund._date > $end" : '';
+ my $pay_start = $start ? "AND cust_pay_refund._date <= $start" : '';
+ my $pay_end = $end ? "AND cust_pay_refund._date > $end" : '';