+};
+
+sub link {
+  my ($self) = @_;
+
+  my $html;
+  $html   = SL::Presenter->get->purchase_invoice($self, display => 'inline') if $self->invoice;
+  $html   = SL::Presenter->get->ap_transaction($self, display => 'inline') if !$self->invoice;
+
+  return $html;