Mobile device merchant availability interface

A system, comprising:

• a point-of-sale device comprising:
• processing circuitry configured to generate point-of-sale data;
• a mobile device comprising:
• a touch screen display configured to receive tactile user inputs;
• and
• processing circuitry configured to:
• display a multi-level tiered graphical user interface (mGUI) on the touch screen display, wherein:
• a first level of the mGUI includes a slot management interface, wherein the slot management interface indicates one or more slot availabilities;
• the mGUI includes the first level and a second level;
• the first level includes one or more first level objects each representing a non-empty slot of one or more non-empty slots;
• the first level further includes one or more empty slot regions each representing an empty slot of one or more empty slots;
• and
• the second level is associated with one or more second level interfaces each associated with a first level object of the one or more first level objects;
• receive, via the point-of-sale device, point-of-sale data;
• update the slot management interface based on received point-of-sale data;
• monitor receipt, via the touch screen display, of tactile user inputs;
• and
• in response to receiving tactile user inputs:
• determine, while the first level is displayed on the display, whether the tactile user inputs indicate a multi-touch expand input associated with a particular first level object of the one or more first level objects or a single touch associated with a particular empty slot region the one or more empty slots;
• and
• in response to determining that the tactile user inputs indicate the multi-touch expand input:
• determine a non-empty slot associated with the particular first level object as a selected non-empty slot based on starting points of the multi-touch expand input;
• and
• display the second level of the mGUI within the touch screen display, wherein the second level includes a slot interface for the selected slot;
• and
• in response to determining that the tactile user inputs indicate the single touch:
• determine an empty slot associated with the single touch based on a touching point of the single touch as the selected empty slot;
• add a new first level object corresponding to the selected empty slot to the one or more first level objects;
• and
• add a new second level interface corresponding to the new first level object to the one or more second level interfaces.