How do I change the card number that my card gets charged 9.99$

See this article about updating payment methods on various platforms (iPhone, Mac, etc.): If you need to change or update your Apple ID payment method - Apple Support

"If you change your address, the credit or debit card information that you use with your Apple ID might be automatically updated by your financial institution, and you don't need to take action. But if there's an issue [such as you having a subscription or being a Family Sharing Organizer], add a new card first, then remove the old card."

According to Add a payment method to your Apple ID - Apple Support you can also add a payment method after signing in to https://appleid.apple.com .

In some countries and regions, when you edit payment information online at appleid.apple.com, additional payment methods might be removed from your account automatically.

Here is how you update your payment method on an iPhone or iPad:

1. Open the Settings app.

2. Tap your name.

3. Tap Payment & Shipping. You might be asked to sign in with your Apple ID.

4. Tap Add Payment Method, enter the new payment method, then tap Done.

5. Tap Edit.

6. Tap the red delete button next to the old payment method, then tap Delete.

If you have multiple cards entered, here's how to change the payment method order for your Apple account after Apple account balance. For the first four steps, refer to the first image in this Support article Add a payment method to your Apple ID - Apple Support where it says to tap Edit to reorder or remove a payment method.

1. Tap on the Settings app.

2. Tap on the Apple ID section at the top of the page.

3. Tap on iTunes & App Store.

4. Tap Edit.

5. Tap and hold on your preferred Card and drag it to the top.

6. Tap Done.