A patch. Every field is optional and an omitted one is left untouched — this is deliberately not a full replace, because empty is meaningful on most of these fields (an empty email_template_key falls back to key, an empty token_unit means no wallet, a null date means unbounded) and a replace would let an omitted field silently wipe configuration that gates discounts and token issuance.
campaign_id is absent on purpose: it is immutable, since orders, vouchers and already-issued tokens all reference it.