+=item install_callback
+
+A package can install a callback to be run in adminsuidsetup by passing
+a coderef to the FS::UID->install_callback class method. If adminsuidsetup has
+run already, the callback will also be run immediately.
+
+ $coderef = sub { warn "Hi, I'm returning your call!" };
+ FS::UID->install_callback($coderef);
+
+ install_callback FS::UID sub {
+ warn "Hi, I'm returning your call!"
+ };
+
+=cut
+
+sub install_callback {
+ my $class = shift;
+ my $callback = shift;
+ push @callback, $callback;
+ &{$callback} if $dbh;
+}
+