Danik

[kindred brook]

No it will only attach the Payment Method to the customer. There could be multiple Payment Methods per a Customer

Indicates that you intend to make future payments with this PaymentIntent’s payment method.
Providing this parameter will attach the payment method to the PaymentIntent’s Customer, if present, after the PaymentIntent is confirmed and any required actions from the user are complete. If no Customer was provided, the payment method can still be attached to a Customer after the transaction completes.