How to access content in confluence from scriptrunner for jira cloud?

[Janco Hoekstra]

I need to access json data that is stored in a Confluence page and use this in Scriptrunner for Jira cloud as a json map.
When I try to access the api endpoint of Confluence  for the page, I get 'unauthorized'.

I tried both possible settings: run script as scriptrunner user and tried it as my own user.
Same result for both cases.

I can't use a normal request as on datacenter with authentication setup. this is predefined in Scriptrunner for cloud, by the setting above (Scriptrunner Add-on user or current user) 

How can I access this json data in Confluence or get authenticated using a service user?