Power is conserved in a mobile device having a lock screen wallpaper by: (1) identifying the mobile device is at a business location, (2) identifying a scanning code to be displayed over a portion of the lock screen wallpaper of the mobile device, the scanning code encoding payment information for conducting a transaction at the business location, (3) activating a display of the mobile device and displaying the scanning code over the portion of the lock screen wallpaper on the activated display of the mobile device which remains in the screen locked state, and (4) conserving power in the mobile device by providing the scanning code over the portion of the lock screen wallpaper of the mobile device, without having to unlock the mobile device.