My child has spent money on Clash Royale, how can I get a refund?

All you can do is try. Refunds are not guaranteed.

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

Apple provides many methods to prevent that from happening, they just need to be used.

• Ask to Buy

Set up Ask to Buy - Apple Support

• Use Screen Time to prevent purchases

Use Screen Time to prevent purchasing - Apple Support

• Require Password for purchases

Require a password for App Store and iTunes purchases - Apple Support

• Many other restrictions can be used with Parental Controls.

Use parental controls on your child's iPhone, iPad, and iPod touch - Apple Support

Anytime you give someone your Passcode/Password, you are authorizing them to use the device and that includes purchases. Protect your passwords and change them if anyone else knows them.

1. App Purchase
   1. Curious about a Charge? --> If you see an 'itunes.com/bill' or an unfamiliar charge on your statement
   2. If you have an issue with an app on the App Store or billing --> Request a refund for an App Store or iTunes Store
2. Subscriptions
   1. You may view a subscription to an app --> See or cancel your subscriptions - Apple Support
   2. You can also request a refund for a recent renewal of an in-app subscription purchase 

Avoid accidental purchases

1. If it is your device then, please --> Use Guided Access with iPhone, iPad, and iPod touch - Apple ... before handing over a device to a child.
2. If it is your child's device then in the future, enable the Ask to Buy feature --> Request and make purchases with Ask to Buy - Apple Support

You can ask for a refund, but Apple is not obligated to give you one as sales are typically final in the App Store.

Here is a link you can use to ask for a refund --> Request a refund for apps or content that you bought from Apple - Apple Support

Click ▶︎ Request a refund.

According to Apple:

If your refund is approved, the funds are applied to the same payment method that you used to buy the item.

Here's how long it takes for a refund to appear on your account or statement:

Store credit—It might take up to 48 hours to see the refund in your Apple ID balance.

Mobile phone billing—It might take up to 60 days for the statement to show the refund. Processing time might be affected by your carrier. You can contact your carrier for an update.

All other payment methods—It might take up to 30 days for the statement to show the refund. If you don't see the refund after 30 days, contact your financial institution.

Click ▶︎ Check Refund Status.