Worth paying for a certificate? after 15 years as an accountant

I am considering a short certificate to improve my chances as an accountant. I am unsure whether employers value it. Which ones are overrated?

Keep everything in writing and save the confirmation numbers. It made the follow-up calls so much easier.

Thanks for writing this out. I went through something close to it last year, and it got easier once I kept a simple log of every call and form.