allow staff to add a grace period to service/invoice due
Just ran into an interesting usecase...
- Blesta is set to auto-suspend unpaid services after 7 days, and cancel after 10
- a Client has an active service and notifies staff via ticket that his payment will not arrive in time (for whatever reason).
- Staff decide to make a one-time exception and add an extra "15 days" of grace period to the service (only for the current month) to ensure the service stays active