Hi there, @teambrown.
Thank you for joining the Community. I'd be happy to help share some information about Routines for QuickBooks Online.
Good news. The automatic routine tasks are one of the new feature included on the December 2018 QuickBooks Online updates. There's no cost for this plug-in, and you only need to activate it on the QuickBooks Labs to make this available.
I've attached some articles for more details about this:
These resources should help to get you on the right track for setting up the invoice reminder in QuickBooks Online. Drop me a comment below if you have any other questions with QuickBooks. I'll be happy to help you out. Wishing you and your business success.
