The call center isn't always accurate and if you're buying tickets online they might be for adults, like the am day dinning and children under two do not eat free.
You can scan your pass and buy them at the kiosk at the park. That's the easiest way.
I believe you can but it would be a smoother process to do over the phone
I dont know howeever i know you need to buy the same day and used it
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