ZATCA Phase 2: signing units, onboarding, clearance and the archive
Registering a ZATCA signing unit, onboarding it with an OTP, compliance checks and the production certificate, switching Phase 2 on over Phase 1, what Post does, clearance and reporting, ZATCA Submissions with Resubmit and Re-issue, the dashboard, the API log, the append-only archive, PDF/A-3, and the ksademo sandbox walk-through.
Phase 1 makes an invoice that cannot change. Phase 2 makes one that can prove it has not: each is hashed, signed and chained to the one before.