Problems Linking a Credit Card
For security purposes, you must link a bank-issued debit card to your account before you can link a credit card. Cash App supports U.S.-issued credit cards from Visa, Mastercard, American Express, and Discover.
To link your debit card:
Tap the Profile Icon on your Cash App home screen
Select Linked Banks
Tap Link Bank
Tap Link Debit Card
Follow the prompts on the screen
The Link Credit Card option will appear under Linked Banks in your Account tab after you’ve linked a debit card.