I built https://check.supply with a friend - it’s an iOS app that is like a cash app experience for mailing a check. Old school landlords, paying gardeners, or other people still only accepting checks. We use plaid to connect your account, then press send, then track the printing, mailing and delivery of the check. Only iOS App here: https://apps.apple.com/us/app/check-supply/id6475490646
are you using lob to print/mail everything?
In fact there are several providers that offer checks via api but none of them worked for us, so we rolled our own :)