These bank accounts are payment methods on Customer objects.
Customer
On the other hand External Accounts are transfer destinations on Account objects for Custom accounts. They can be bank accounts or debit cards as well, and are documented in the links above.
Account
Related guide: Bank debits and transfers
You can store multiple cards on a customer in order to charge the customer later. You can also store multiple debit cards on a recipient in order to transfer to those cards later.
Related guide: Card payments with Sources
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account
bank_account
card
pii