+=item apply_credits
+
+Applies (see L<FS::cust_credit_bill>) unapplied credits (see L<FS::cust_credit>)
+to outstanding invoice balances in chronological order and returns the value
+of any remaining unapplied credits available for refund
+(see L<FS::cust_refund>).
+
+=cut
+
+sub apply_credits {
+ my $self = shift;
+
+ return 0 unless $self->total_credited;
+
+ my @credits = sort { $b->_date <=> $a->_date} (grep { $_->credited > 0 }
+ qsearch('cust_credit', { 'custnum' => $self->custnum } ) );
+
+ my @invoices = sort { $a->_date <=> $b->_date} (grep { $_->owed > 0 }
+ qsearch('cust_bill', { 'custnum' => $self->custnum } ) );
+
+ my $credit;
+
+ foreach my $cust_bill ( @invoices ) {
+ my $amount;
+
+ if ( !defined($credit) || $credit->credited == 0) {
+ $credit = pop @credits or last;
+ }
+
+ if ($cust_bill->owed >= $credit->credited) {
+ $amount=$credit->credited;
+ }else{
+ $amount=$cust_bill->owed;
+ }
+
+ my $cust_credit_bill = new FS::cust_credit_bill ( {
+ 'crednum' => $credit->crednum,
+ 'invnum' => $cust_bill->invnum,
+ 'amount' => $amount,
+ } );
+ my $error = $cust_credit_bill->insert;
+ die $error if $error;
+
+ redo if ($cust_bill->owed > 0);
+
+ }
+
+ return $self->total_credited;
+}
+
+=item apply_payments
+
+Applies (see L<FS::cust_bill_pay>) unapplied payments (see L<FS::cust_pay>)
+to outstanding invoice balances in chronological order.
+
+ #and returns the value of any remaining unapplied payments.
+
+=cut
+
+sub apply_payments {
+ my $self = shift;
+
+ #return 0 unless
+
+ my @payments = sort { $b->_date <=> $a->_date } ( grep { $_->unapplied > 0 }
+ qsearch('cust_pay', { 'custnum' => $self->custnum } ) );
+
+ my @invoices = sort { $a->_date <=> $b->_date} (grep { $_->owed > 0 }
+ qsearch('cust_bill', { 'custnum' => $self->custnum } ) );
+
+ my $payment;
+
+ foreach my $cust_bill ( @invoices ) {
+ my $amount;
+
+ if ( !defined($payment) || $payment->unapplied == 0 ) {
+ $payment = pop @payments or last;
+ }
+
+ if ( $cust_bill->owed >= $payment->unapplied ) {
+ $amount = $payment->unapplied;
+ } else {
+ $amount = $cust_bill->owed;
+ }
+
+ my $cust_bill_pay = new FS::cust_bill_pay ( {
+ 'paynum' => $payment->paynum,
+ 'invnum' => $cust_bill->invnum,
+ 'amount' => $amount,
+ } );
+ my $error = $cust_bill_pay->insert;
+ die $error if $error;
+
+ redo if ( $cust_bill->owed > 0);
+
+ }
+
+ return $self->total_unapplied_payments;
+}
+