App that links Calendar and Invoice

[Surf3184]

I am a psychotherapist and I have been searching long and a hard for an app that can pull from my calendar which I use for scheduling and populate an invoice. Right now I am using Invoice2Go, which I like a lot and it has an in-app add on for a calendar but does little to enhance. If I add an appointment to the calendar then create an invoice from that, it appears on the invoice as a line item. I still have to manuallly add the name, fee, etc.

What I am looking for is a calendar where I can enter the name, service, fee, then click 'create invoice' and have that info populate the invoice.

Anyone have any ideas?

Thanks!