OnFly

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## OnFly

Enables on-the-fly item additions to the shopping cart. If set to the name of a valid UserTag, that tag definition will be used to parse and format the item with the following call:

        $item = Vend::Parse::do_tag($Vend::Cfg->{OnFly},
                                        $code,
                                        $quantity,
                                        $fly[$j],
                                    );

$fly[$j] is the value of `mv_order_fly` for that item. An `onfly` tag is provided by MiniVend -- see <On-the-fly> ordering.

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