What financial policies should every CSO in T&T have in place?

We have a financial policy from about 2015 that nobody really looks at anymore. I dug it out recently and it’s very basic and definitely out of date — doesn’t even mention electronic payments. I want to do a proper update but I’m not sure what a good financial policy for an organisation like ours should actually cover. What are the non-negotiables? I know things like authorisation levels and procurement, but what else? Any guidance on what a solid, practical financial policy looks like for a small CSO would be great.