How can I sign an e-invoice?

An invoice must be signed either by your own certificate or by a delegated signature (a third party signature).

On the Docuten platform you can choose which method you would like to use to sign an invoice by either activating the delegated signature option or by uploading your own certificate. As you can see below, you can manage this option in “Preferences” > “Invoice format”.

Both signature methods are equally valid from a technical or legal standpoint.