You can easily change it by deleting your payment profile i.e.resubmitting your payment profile again with the right code and Bank details.
You must confirm before payment that you had putten right information before the payment process.
Google AdSense doesn't work in the matter after they send their payment.
They had clearly mentioned that they will not help you in any process of payment submission.
So it is your responsibility to check it.
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kya me AdSense Approval ke bad payment setting update Kar Sakta hu?
Can I change my bank details after AdSense Approval?
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