ABRA Flexi can sign documents issued as PDFs with an electronic signature. The prerequisite is that you have a valid personal certificate uploaded in the application.
Procedure
Upload the certificate according to the instructions in Certificate Management. Once a valid certificate has been loaded, PDF invoices are automatically generated with an electronic signature.
⚠️ Having trouble uploading the certificate? The most common cause is the format in which it was exported. The solution is described in the article Unable to Upload Electronic Signature Certificate.
Signed PDF via REST API
If you generate PDFs via REST API, additional special conditions apply — the certificate must be uploaded via the desktop application, and a parameter for the signature must be added to the request. You can find details in the article Generating a PDF with an Electronic Signature.