| CPC G06Q 20/203 (2013.01) [G06Q 20/085 (2013.01); G06Q 20/207 (2013.01); G06Q 20/4014 (2013.01); G06Q 30/0633 (2013.01); G07C 9/00 (2013.01)] | 21 Claims |

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1. A computer-implemented method, comprising:
under control of one or more computing systems configured with executable instructions:
generating, with at least one of a plurality of cameras located within a materials handling facility, a plurality of images of an inventory location, wherein the plurality of images include a first image of an object before the object enters the inventory location and a second image of the object after the object is removed from the inventory location;
comparing a first plurality of pixels of the first image with a second plurality of pixels of the second image to determine a first item is included with the object in the second image that is not included with the object in the first image;
in response to determination that the first item is included with the object in the second image, determining a first item pick by a user of the first item from the inventory location;
comparing at least one of an identity of the first item or a feature of the first item with stored inventory item information to determine that the first item is an inventory item associated with the inventory location and offered for sale by a first seller;
in response to determining that the first item is the inventory item, updating an item identifier list corresponding to the user to include a first item identifier of the first item;
subsequent to the first item pick, determining an in-facility purchase of the first item and a second item offered for sale by a second seller, wherein:
the in-facility purchase is between the user and the second seller;
the in-facility purchase includes a payment, by the user to the second seller, of a first purchase price for the first item, a first tax for the first item, a second purchase price for the second item, and a second tax for the second item; and
the second seller is a seller of record of the first item and second item;
subsequent to the in-facility purchase, determining that the user is exiting the materials handling facility; and
in response to determining that the user is exiting the materials handling facility, causing a payment of at least a portion of the first purchase price from the second seller to the first seller.
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