Adds a card on file to an existing merchant.
POST
/v2/cards
Adds a card on file to an existing merchant.
A unique string that identifies this CreateCard request. Keys can be any valid string and must be unique for every request.
Max: 45 characters
See Idempotency keys for more information.
The ID of the source which represents the card information to be stored. This can be a card nonce or a payment id.
An identifying token generated by Payments.verifyBuyer(). Verification tokens encapsulate customer device information and 3-D Secure challenge results to indicate that Square has verified the buyer identity.
See the SCA Overview.