I read through your requirements.
What you need is a Business process management tool customized to your needs + harnessing the google drive API to transact automatically on your behalf.
We have experience in both these areas.
I am Pranav Patil, representing Iristechsys Software Services LLP, an ISO 9001:2015 company based out of Pune, India.
Our company has a valid DUNS number and is duly registered with Registrar Of Companies, India - just to point out that we are *not* a fly by night operator.
My Linked-In profile will provide you overview of my experience.
Our forte is processes and consulting.
We do not merely implement what the customer tells us to do, but proactively understand the intent and suggest better solutions and implementations. And its implemented with due testing, documentation and traceability.
Our existing customers in the EU and US will vouch for it.
Please provide us an opportunity to demonstrate and I promise we will not disappoint you for sure!