What is the difference between authorisation and confirmation?

Authorisation is done before checking the invoice. Authorisation means you approve or reject the invoice immediately after it enters the TriFact365 workflow.
Read more about Authorising:

• Set up authorisation
• How to authorise?

Confirmation is done after checking the invoice. With confirmation you approve or reject the final booking proposal of this invoice. After this, the entry is made in the accounting software.
Read more about Conformation:

• Set up confirmation
• How to confirm?