Email with multiple links
Under Documents, option to display outstanding invoice per company then send ONE email containing all the links to outstanding invoice.
I have several clients who made a comments that they thinks the emails are duplicate. I guess they don't pay attention to the subject.
I use re-occurring and I have a client with two outstanding invoice. They pay the newer invoice thinking both invoices are combined together.
It's creating some confusion. Sending one email with multiple links will make it clear they have more than one outstanding invoice.
Another option, when we send new invoice, an option to automatically add a link to older invoice as a reminder.