Accounts payable workflow and imaging(document retention) recommendations

We are looking at implementing an solution that will provide workflow and imaging(document retention) for accounts payable invoices.  We are using EBS 12.1.  Most of our invoices are non PO and require an approval.  We would prefer a could based solution that has the potential to expand an provide workflow for other areas of accounting and potentially corporate wide.

We're finding cloud based solutions require a substantial amount of data to be extracted from EBS and pushed to the workflow solution.

I'm curious what others are using and if they have any issues with extracting data.

Thank you.