Accounting processing method, registration processing method, accounting device, and storage medium

A checkout system, comprising:

• a plurality of registration devices, each registration device of the plurality of registration devices is located in a corresponding physical store of a plurality of physical stores, each registration device executes, for each transaction in the corresponding physical store, at least a registration process comprising:
• identifying a customer that visits the plurality of physical stores based on receiving an input that comprises a customer identifier;
• and
• generating transaction data that comprises purchase commodity information, the customer identifier, and a store identifier of the corresponding physical store;
• an accounting component comprising
• a display,
• a processor,
• at least one storage that
• stores a control program that controls operation of the accounting component, the storage maintains stored content when power from a power supply is removed, the control program, when executed by the processor, causes the accounting component to execute accounting processing for the purchase commodity information based on registration data by the plurality of physical stores, the processor, and
• stores the registration data in a table of the storage;
• and
• a checkout device configured to:
• obtain, via a network, a plurality of the transaction data generated for each of the plurality of physical stores, the plurality of the transaction data was not settled at the plurality of physical stores,
• based on the registration data in the table of the storage, execute, during a single account processing transaction, a collective checkout process for all purchased commodities, and
• print a receipt that includes details of the plurality of the transaction data identified by store for each of the plurality of physical stores,
• wherein the display outputs a result that comprises the details of the plurality of the transaction data identified by store for each of the plurality of physical stores.