How Do You Split Costs with Your Ex?

Curious how other dads manage child support, daycare, and other kid-related costs with their ex.

Do you usually send payments through Venmo, Zelle, or something else?
And do you track those expenses anywhere, like a spreadsheet, budgeting app, or co-parenting tool?

I’ve been trying to find a simple way to log and track shared expenses (without getting overly complicated), so I’d love to hear what’s actually working for you guys.