Apple Card bill
Can I pay
my Apple Card bill with my Mastercard credit card? If so, how?
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No. You cannot pay one credit card with another. That is tantamount to fraud, unless you do so through the credit restructuring mechanisms such as Balance Transfer or Cash Advances. Link-> https://www.chase.com/personal/credit-cards/education/basics/can-i-pay-off-a-credit-card-with-another-credit-card
You can only pay Apple Card with money from a bank account, debit card or Apple Cash.
If you can take a cash advance out of your other credit card and added to a bank account, you can use that to pay the Apple Card.