Only your bank has that information, I'm not sure how Apple plans to get users balance. I think even an ATM from other bank can't check your account balance at the moment.
I guess they can only get information if you have enough credit to buy something with exact price - they can ask do you have 5$ to buy an app. But they can't know that you have 1000$ of credit to spend. In that case they should ask are you able to buy each one of their products before an ad is placed on your device. That doesn't make much sense to me.
Would they use information that ApplePay can access? I have not used ApplePay, but isn't it a payment app that can use linked accounts like your credit and bank accounts, so it would know these balances?
That's...interesting. What exactly is the legality of looking at someone's account balance?
Only your bank has that information, I'm not sure how Apple plans to get users balance. I think even an ATM from other bank can't check your account balance at the moment.
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Would they use information that ApplePay can access? I have not used ApplePay, but isn't it a payment app that can use linked accounts like your credit and bank accounts, so it would know these balances?
The only information Apple Pay has access to is your credit card number, which it can securely provide over NFC when requested.