Mobile payment device

FIG. 1 is a top, front and left side perspective view of a mobile payment device, showing my new design;

FIG. 2 is a bottom, rear, right side perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a right side elevation view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof; and,

FIG. 9 is another rear elevation view showing a use state of the mobile payment device.

The broken lines are included to show features that form no part of the claimed design.