What has changed compared to the former way of issuing documents

As stated by law (Decree-Law no. 28/2019), in order to be able to issue documents each issuer must report, for each type of tax relevant document and means of processing, the sequences they intend to use, in order to obtain a validation code with which the respective ATCUD will be comprised. The Tax Authority provides two different mechanisms for communicating the series and obtaining the respective validation code: manually, via the Tax Portal, or by application using a webservice.

In InvoiceXpress, when registering the sequence, the communication for each type of document is made using a webservice. Thus, a unique series validation code is assigned to each type of document.