Hello MarkusMalaysia,
We understand you want to create an Apple ID for a child, and have questions about the verification that is being asked. In order to verify you are an adult creating the account, you will need a credit card. You'll then put that security code in, which is why it's being asked, to complete the account creation.
Here's our best resource: Create an Apple ID for your child - Apple Support
To verify that you're an adult, you need a credit card. On your iPhone, you can also use a driver's license or state ID added to Wallet where available.
As stated, it also mentions that depending on your region, you may be able to use a driver's license or state ID added to your Wallet. Here are steps for that: Add your driver's license or state ID to Apple Wallet - Apple Support
Make sure the following criteria are met:
To add your license or ID to Apple Wallet, you need:
- An iPhone 8 or later, or an Apple Watch Series 4 or later, with the latest version of iOS or watchOS.
- Face ID or Touch ID turned on.
- An Apple ID with two-factor authentication turned on.
- A license or ID from a participating state. Learn which states participate
- Your device region set to United States.
If you have further questions, let us know.
Take care.