How can we improve WHMCS?

Different clients have different payment schedules that are agreed upon. For example most clients have net-30 payment schedule and some clients have net-60 payment schedule.

Since the "number of days before the due payment date to generate invoices" setting is a global WHMCS setting that affects all clients, its not possible to have custom payment schedule settings per client.

The clients that have net-60 day schedules complain every time an invoice is generated that the due date is incorrect compared to what was contractually agreed upon. Short of custom developing a solution ourselves, I am submitting this feature request with confidence that there are more people out there with this (not really that unique) requirement.

A setting on a per-client basis that allows you to :

1. Enter the due date from invoice generation (i.e. invoices are due 60 days after being generated)
2. Enter the days prior to due date that invoices are generated