What percentage does Ko-fi take?

Excuse me, could you please clarify what percentage does Ko-fi typically take from transactions? I'm interested in understanding their fee structure and how it may impact creators and supporters using the platform. Is there a flat fee or is it a percentage-based system? Also, does this percentage vary depending on the type of transaction or the amount being processed? It would be great if you could provide a concise overview of Ko-fi's fee policy.