Hi Xue! Welcome to the Disney Parks Moms Panel!
You must be excited for your spook-tacular night at
Mickey's Not-So-Scary Halloween Party! I hope you are ready for lots of hauntingly good fun as you Trick-or-Treat your way away Magic Kingdom Park. This year is extra special with the new
Disney's Not So Spooky Spectacular fireworks show. I can't wait to see it!
Memory Maker One Day should be able to be purchased on the
My Disney Experience mobile app,
Disney PhotoPass Centers (in Magic Kingdom Park it is located inside Town Square Theater), or at any ticket window. You have to wait to purchase it in the mobile app until you have taken at least one
PhotoPass photo that day. Once the picture is taken and in your
My Disney Experience account, you should be able to purchase Memory Maker One Day through the mobile app. If you are having any issues, you can ask a nearby Cast Member for assistance, or head to the Disney PhotoPass Center and they can get your Memory Maker One Day all set up!
I hope this helps, Xue! Please let us know if you have any other questions.
Tabitha