CAJ is an application allowing you to photograph a document from your smartphone and send it automatically and in a completely secure way to the associated accounting file of the Comptes@jour accounting software. The user of this software, whether a company or an accounting firm, will be able to use and process this document. Once sent, these documents are destroyed, so that they do not clutter the storage memory of the smartphone, nor can they be exploited by third parties for any purpose. However, before sending them, an option also allows the transmission of these documents on social networks or by email.