Response mapping saves a value from a JSON response on the note. It is available only in note-level workflows, and it can set only source_id.
Open the API Call step and go to Response mapping.
Add an item with the name
source_id.Enter the path in the response as the value, for example
noteIdordata.items.0.id.
Kolleno does not replace a different source_id that the note already has.

