ESS for Leave applications Issue statements and invoices to clients, based on proactive study and understanding Improve cash flow through efficient and regular invoicing. Reconcile creditors and debtors' accounts and accounts and push for the payment of outstanding invoices, including proactive escalation to directors where where resistance to payments develops. Track and invoice and collect administrative costs disbursed on behalf of clients into projects. Manage inter-company invoicing for the use of shared resources and equipment