We want to create an invoicing tool where we can create, send & follow-up our invoices.
This means a complete flow from Offer to Invoice.
Special is the necessity to create Recurring Invoices that automatically appear once every X months.
We also want to send out these invoices from this tool via email.
Once invoices are created (final) we want to save a PDF-version of them.
Full specs are not yet written out, but general flow is described in attach.
Which software environment is not really important, could be in Access...