How can I get a bitcoin address which allows a customer to see funds of their wallet but not deposit? Deposit needs to be done by a 3rd party

According to another user here I am mistaken about how public keys work. I want a customer to have a wallet to which they have a public address to view funds only and I have another public address to deposit to. How can I derive such a key that can view only but not deposit to the public address? I want to make a crypto gift card I can reload and my customers can verify funds.



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