A client device is configured to generate checksums for attributes of product records to be transmitted to a marketplace operator system that provides an e-commerce marketplace. On subsequent transmissions of the product records, the client device can utilize the checksums to determine if the attributes of the product records have been modified since a previous transmission. If the attributes have not been modified, the client device does not re-transmit the unchanged attributes to the e-commerce marketplace. The client device may also be configured to retrieve a checksum configuration file from the marketplace operator system that includes data defining the manner in which the client device should compute the checksums.