my son use my phone to purchase a dice can be refund to me

Possibly. Follow this guidance→Request a refund for apps or content that you bought from Apple - Apple Support

And for the future go to Settings/Screen Time/Content & Privacy Restrictions and turn off App Store and In-app purchases. And make sure Screen Time has a passcode that your son does not know.

hee 2020 Said:

"my son use my phone to purchase a dice can be refund to me: my son use my phone to play game i dun know he buy something in game！when i check is alot of money can be refund to me"

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Thank you for the screenshot.

Getting a Refund:

Make a Request...

Start Here: Request a Refund for Apps or Content that you Bought from Apple - Apple Support. Note that refunds can take up to 30 days to be received.

No Success?...

For Financial Assistance, Contact Apple Store Support:

You need to contact Apple Support Directly. This is a User-to-User forum. We are all volunteers. So, as you may suspect, no one here has access to that information — and that is a good thing, BTW. That’s why for Financial Assistance, you need to contact Apple Support. They’ll see what’s going on and will run you through the fix.

Apple Contact Info:

• Contact Us - Choose Locations
• Proceed from there, as necessary
• Why the Wait: Phone calls are taking a bit to go through at the moment, due to lots of calls. With the Coronavirus Pandemic, many are at home at the moment, with much time on their hands to contact Apple. So, just stay on the line, and you will get through :)

You can try asking for a refund, using the link below, but I’m not sure this will qualify. You may not want to allow your son to play with your iPhone any more.

Request a refund for apps or content that you bought from Apple - Apple Support