Can I connect my Apple Card with cash app
Can I add my Apple Card to my cash app
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No.
The Apple Card is a Mastercard credit card. You can only use a debit card or some prepaid cards. See the following from Add money to Apple Cash - Apple Support
2 - You can't use credit cards with Apple Cash, and you might not be able to use some prepaid cards. You can't add money from a gift card, even if it's already in Wallet.