Default: : empty
The name of the hidden input field that contains the hold token. Only makes sense when a session is active.
It will be created automatically - you should not create the input field yourself.
The hold token is needed to definitively book seats that were temporarily held. It must be supplied as a parameter to
/changeStatus requests for held objects.
chart.holdToken also contains the generated hold token - so you don't need the hidden form field generated by supplying