Many shops create quotes and invoices in the operational system while bookkeeping itself happens in sevDesk. That is exactly where the integration helps: relevant contact, quote and invoice data no longer has to be maintained twice and stays consistent between PlotonIQ and sevDesk.
The important part is not just exporting a PDF. The real value is a clean data flow. Customer records, document states and VAT handling for domestic, EU and third-country cases need to arrive in a form your office or accountant does not have to manually repair.
In practice this means PlotonIQ remains your system for sales, calculation and job handling, while sevDesk remains your bookkeeping system. The copy-paste work between the two disappears.