You prepare the invoices in Calabi and send them from there to Billit. In Billit, you can check them and adjust them if necessary before sending them to your customer.
Step 1: To send an invoice to Billit, first go to 'Facturen' in the Calabi menu. Select an invoice you want to process and click 'Verstuur naar Billit' at the bottom.

Step 2: In Calabi, you will see the message 'Factuur verstuurd naar Billit'. Your invoice is now available in Billit under 'Income'. If necessary, you can still edit the invoice.
Step 3: After checking it, click the 'Send' button. If your customer is connected to the Peppol network, you can then choose 'Send via Peppol'. If not, you can also send your invoice by email.