Abstract: Described herein is a system and techniques for implementing a single mechanism that, when activated, provides multiple shopping cart previews for different resource providers generated based on a list of items which is customized according to the user that activated the mechanism. In some embodiments, a list of item types may be received by the system from the user including item types. The system may identify a number of potential items for each of the item types in the list of item types available at each resource provider. The user may then be provided with a shopping cart preview with the list of items from each resource provider. In some embodiments, the user may be provided with the ability to complete a transaction for one or more of the shopping cart previews.

Abstract: Described herein is a system and techniques for implementing a single mechanism that, when activated, provides multiple shopping cart previews for different resource providers generated based on a list of items which is customized according to the user that activated the mechanism. In some embodiments, a list of item types may be received by the system from the user including item types. The system may identify a number of potential items for each of the item types in the list of item types available at each resource provider. The user may then be provided with a shopping cart preview with the list of items from each resource provider. In some embodiments, the user may be provided with the ability to complete a transaction for one or more of the shopping cart previews.

Abstract: Systems and methods for substitute item selection are presented. The methods include providing for presentation first user interface data comprising item preference information representing a substitution preference of an item, a first user interface generated with the first user interface data being configured to receive a change command from a user, wherein the first user interface comprises a unified substitution preferences user interface available from a plurality of order building stages. The methods also include providing for presentation second user interface data in accordance with receiving the change command, a second user interface generated with the second user interface data being configured to present an item substitution suggestion, and to receive item substitution information. The methods also include receiving the item substitution information via the second user interface and storing the item substitution information in a data store.