A richer commercial layer for a digital-marketing agency: fixed-term & open-ended retainers, one-off projects with installment/milestone billing, and ad-hoc add-ons — all on the company.
Recurring retainers (with fixed term + renewal and setup fee), projects with milestone installments (50% advance → on approval → on delivery), and add-ons. Plus the unified "Add service" drawer that branches by type.