Abstract: In some examples, a computing device may receive, from a first user device, a communication indicating a request to create a combined order for items offered by one or more merchants. For example, the combined order may enable a plurality of users to independently purchase individual ones of the items from the one or more merchants. The combined order may be created having an initial condition and may be accessible by the plurality of users for adding items to the combined order. At least one selection of a respective item may be received from each user of the plurality of users. For instance, each selection may change the condition of the combined order. In addition, the computing device may process the items added to the combined order as a single order to perform at least one action.

Abstract: Techniques are described for securely managing double-entry account journals provided for use by clients such as businesses and other organizations. Clients may implement their own accounting systems, or other systems that model financial information, which may use the described techniques for maintaining account journals. The described techniques include receiving transaction requests that specify journal entries, and making those entries in the specified account journals. A cryptographic authentication tag is calculated for each journal entry, based on authentication keys of a forward-secure sequence of authentication keys. This allows a service to verify, in response to a client request, that the order of the entries has not been altered after creation of the entries. The transaction requests may be signed by the client and the signatures saved so that the service can also verify that the entries are as provided by the client.

Abstract: In some examples, a first device of a first buyer may receive a selection of a first item offered by a selected merchant. The first device may determine whether any second devices are within a threshold distance of the first device. Based on a second device being within the threshold distance, the first device may send, to the second device, a communication for creating a combined order. Receipt of the communication may cause the second device to present, to a second buyer, an interface for creating a combined order. The second buyer may use the second device to select a second item to order from the merchant. At least one of the first device or the second device may send combined order information to a service computing device, which may send the combined order to the merchant and schedule a courier to deliver the ordered items to the buyers.

Abstract: Techniques are disclosed for file system monitoring in a system which incrementally updates clients with what occurred in a cloud-enabled platform. In one embodiment, a method comprises, in response to an event which represents that a modification to an item has taken place on the cloud-based platform, identifying whether execution of the event is to violate any local file system rule. The method further comprises, if the execution of the event is to violate any local file system rule, buffering the event until a subsequent event arrives. The method further comprises identifying whether execution of an aggregate of the events is to violate any local file system rule.

Abstract: In some examples, a first device associated with a first buyer may present information related to a plurality of merchants offering items for delivery. The first device may receive, as a first order, a selection of a first item offered by a selected merchant. The first device may determine that a second device is within a threshold distance of the first device, and may send, to the second device, a communication for creating a combined order, such as for dividing a delivery fee associated with the order. A second buyer may use the second device to select a second item to order from the selected merchant. At least one of the first device or the second device may send order information to a service computing device, which may send the combined order to the first merchant and schedule a courier to deliver the order to the buyers.