IssueInvoice now rejects free-grant orders before it will consume an invoice
number for them — a full gift produces no invoice at all, while a discounted
grant still charges something and is invoiced exactly like an ordinary sale.
Keyed on the linked subscription/add-on's own provenance, not on the amount
being zero, so a genuinely fully-discounted Stripe checkout is unaffected.
Revenue excludes granted contracts from MRR/ARR/ARPU and the contracts count
— a gift at 0 must not drag the average down — and shows their number as its
own KPI instead of folding it in, since the owner measures himself on it.
The portal (Cloud, Billing) shows a granted package or module without a
price at all: not "free", not struck through, just the service, so a later
conversion to paid does not read as a negotiation.
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