In Candis, we currently have no possibility to pay invoices. But you can export payment lists and run them in your other program (online banking).

You have DATEV, then you can use the function "Create transfer" in Candis. In the processing, or directly in the contact, you can specify whether this invoice must still be paid manually.

This information is sent directly to DATEV Unternehmen online and the invoices can be paid with a few clicks.

In the following article (only available in German) from the DATEV help center, you will find under point 4.5 how to complete the payment in DATEV Unternehmen online.