The ornamental design for a paymentcard with a machine-readable code surface, as shown and described.
FIG. 1 is a first view of a first front surface of the payment card having the machine-readable code on the first surface with an embedded payment card chip showing our new design; and,
FIG. 2 is an enlarged area of the payment card showing the embedded payment card chip circumscribed by rectangular broken lines taken from FIG. 1 showing our new design.
The broken lines showing the payment card, portion thereof, or other features form no part of the claimed design.