Searching digital receipts at a mobile device

A method of searching digital receipts, the method comprising:

• storing, on a mobile computing device carried by a customer, a receipt database containing a plurality of digital receipts, each digital receipt thereof documenting a different transaction conducted by the customer;
• conducting a first search of the receipt database while the receipt database is stored on the mobile computing device, the searching comprising:
• receiving, by the mobile computing device from the customer, a digital receipt search request, the digital receipt search request including search criteria, the search criteria defining that digital receipts associated with a specified purchase date range satisfy the digital receipt search request;
• accessing, by the mobile computing device, one or more digital receipts from the receipt database, each of the one of more digital receipts:
• corresponding to a transaction at a Point-Of-Sale (POS) system;
• and
• indicating a purchase date for the transaction;
• identifying, by the mobile computing device, at least one digital receipt, from among the one or more accessed digital receipts, that has an indicated purchase date within the specified purchase date range;
• and
• returning, by the mobile computing device, the at least one digital receipt as satisfying the digital receipt search request;
• presenting, by the mobile computing device, the at least one digital receipt to the customer via a display of the mobile computing device;
• storing, by the mobile computing device, the search criteria;
• and
• conducting, subsequent to the first search, a second search of the receipt database using the search criteria by default.