Justifactu is a Microsoft-cloud-native application that periodically applies curation over a set of documents related to billing at the Institut Català d’Investigació Química (ICIQ). A periodic workflow runs on a schedule and also reacts to the upload of new input documents. Its basic operation is the merging of each bill with its corresponding bank proof; after that stage, the merged documents are archived against the accounting spreadsheets of every unit. It is packaged with Docker and a Makefile-driven build, and documented at iciq-dmp.github.io/justifactu-docs.