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Access Knackhq database from within bubble

Hi, I would like to access data of my knackhq database from within a bubble app.
Could somebody give me some specific advise how to set that up.
Here is a link to how the knack api works.
http://helpdesk.knackhq.com/support/solutions/articles/5000444173-working-with-the-api
Thank you so much fro the help!
regards Marc from germany