code: '''Endpoints  POST /v1/customers/:id/sources   GET /v1/customers/:id/sources/:id  POST /v1/customers/:id/sources/:idDELETE /v1/customers/:id/sources/:id   GET /v1/customers/:id/sources?object=card
  '''
nl: CardsYou 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.