Escalate late approvals, open follow-ups, remind reviewers. Every one is ready to run, and you can adjust it in plain language.
Mark missing receipts on bill tasks before their due dates.
Your payables lead sees missing receipts before bills come due, with the next owner named on the bill task.
Put each unapproved bill due soon on the follow-up task list.
Get clear follow-up tasks for bills nearing payment, so your payables person knows which approvals to chase.