According to an approach for processing image data at network sites, a user invokes functionality on a client device, a scanning device, or a multi-function peripheral (MFP) to cause one or more printed receipts to be scanned to generate image or scan data. The scan data is transmitted by the client device or the MFP to a receipt data management system that maintains access data for a plurality of users and sites. The sites each include a graphical user interface that allows users to manually renter receipt data and request the generation of receipt data processing results. The receipt data management system manages the processing of the receipt data by a specified site on behalf of the user to generate receipt data processing results that satisfy third party requirements. This includes satisfying any authentication requirements of the specified site.