Microsoft store purchase 31.99 on my daughters phone bill, what is this

[Kids]

My latest bill has an extra 31.99 on it for a Microsoft store purchase what is this for

[Cleoriff]

@Kids 

It usually means a purchase of a game or app for Xbox.

You need to sign into Microsoft and check order history

https://support.microsoft.com/en-gb/help/4027310/microsoft-store-view-your-order-history