Found solution to add tickets (Moshtix) to Apple Wallet
Please be nice, i don't usually post to forums...
Old question here: Re: PDF tickets not going to Passbook.
I too had this question as Taronga Zoo uses Moshtix for their events.
On your iPhone, go to Moshtix web site, login to account (which you would have from buying tickets from Moshtix). All events that you have purchased tickets for are listed: click on 'Manage Tickets' to relevant event: each ticket purchased will be revealed with an 'Add to Apple Wallet' link for each one .
Would make much more sense for all ticket providers like Moshtix to add Apple Wallet links in the 'Booking Confirmation and Tickets' email! Would also be better if they would create a single link/option to add all tickets for each event, rather than having to do each ticket one at a time.
Hope this saves someone some time.