Fortnox have a few functions that is triggered by actions through the API. These actions is made with either a PUT request or a GET request, in which the action is provided in the URL.
Use GET when retrieving something like a print action, use PUT when you’re updating something like a bookkeep action.
The action should always be provided after the key of the record, as in the example below.
In this case, bookkeep is the action, the resource is “invoices” and the key of the record is “10”.
The resources that have actions available will have a section with these in their documentation, please see each resource for specific actions.