I would like to change my country/region

If you change Country or Region, you must comply with all regulations described here ->  Change your Apple ID country or region

Change your Apple ID country or region - Apple Support (KW)

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What to do before you change your country or region

• Spend any balance remaining on your Apple Account balance. If you're not sure whether you have a balance, check your Apple Account balance.
• Cancel your subscriptions and wait until the end of the subscription period. 
• Wait for any memberships, pre-orders, movie rentals, or Season Passes to complete, and wait for any pending store credit refunds to process. You can cancel a pre-order.
• Make sure that you have a payment method for your new country or region. See what payment methods you can use.
• Redownload your apps, music, movies, TV shows, and books on any devices that you might use to play or read them in the future. Some types of content might not be available in your new country or region. Learn what types of content and services are available in your new country or region.

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You need to ZERO your Apple Account balance, it is depending on the amount:

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If your balance is less than the cost of a single item, contact Apple Support directly, they will help you clear your Apple Account balance: Get Support

2.

See -> Check your Apple Account balance

Check your Apple ID balance – Apple Support (UK)

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If you have Apple Account balance you can't use.

You can't redeem or return Apple Gift Cards, App Store & iTunes Gift Cards or unused Apple Account balance for cash, except as required by law. If your jurisdiction allows the refund of redeemed gift balances, you can contact Apple Support to request a refund. 

When you contact Apple, include the following information:

•           Your Apple ID.

•           The refund amount.

•           Your current delivery address. 

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You need to Cancel your subscriptions and wait until the end of the subscription period. 

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Make sure that you have a payment method for your new country or region. See what payment methods you can use.

You need to have a debit / credit card issued by a bank in your new country.

You need to have a billing address in your new country.

I understand your situation. Changing your country/region details on WhatsApp can sometimes be a bit tricky, but it is possible. Here's what you can do to update your country/region information:

1. Update your Apple ID or Google Play Store information (for iPhone or Android users):

• • If you are using an iPhone, go to "Settings" > [Your Name] > "iTunes & App Store" > tap on your Apple ID > "View Apple ID" > "Country/Region" > select Germany and follow the instructions to update your billing information.
  • If you are using an Android phone, open the Google Play Store app > tap on the three horizontal lines (hamburger menu) in the top-left corner > "Account" > "Country and profiles" > select Germany and follow the instructions to update your billing information.

2. Change WhatsApp information:

• • After updating your Apple ID or Google Play Store information, you may need to wait for a few hours or up to 24 hours for the changes to reflect in the WhatsApp app.
  • Open WhatsApp and go to "Settings" > "Account" > "Payment info" to verify and update your billing information if required.

3.Contact WhatsApp Support:

• • If the above steps do not work, you can try reaching out to WhatsApp Support directly for assistance. You can find their contact information within the app or on the WhatsApp website.

4.Temporary Workaround:

• • If you urgently need to update WhatsApp and are facing difficulties with the country/region change, you may consider temporarily switching your Apple ID or Google Play Store to a German account. This way, you can update WhatsApp without providing billing information. However, keep in mind that this is not a permanent solution, and you should switch back to your correct account afterward.

Remember to be cautious when making any changes to your account information. Always ensure you have proper backups and understand the implications of changing your country/region settings, especially for payment methods and access to local content on app stores.

Additionally, note that WhatsApp's policies and procedures may change over time, so it's a good idea to check their official support documentation or reach out to their support channels for the most up-to-date information on changing your country/region details.