This is interesting -...

This is interesting - https://elkfox.com/blogs/articles/a-side-by-side-comparison-for-customer-payment-plan-options
Otherwise legals etc on https://www.splitit.com/legals/splitit-merchant-terms-conditions/uk-legal-terms/.
These don't exist on a splitit Australian site yet. Not that I have found anyway.
Yeah, there are some unanswered questions - eg can't find the actual fee schedule!! - and Split-it could do a much better job at clarifying their model to investors. But I'm taking the risk and keeping a close eye. Paying off so far.

PS - I think there was a lot of detail in the prospectus that I don't have. Maybe see some chris1983 posts.