6. Billing Integration Phase 1

Phase 1 of integrating Billing with the Ads domain — build the commercial catalog (LegalEntity, Product, ProductPrice) that invoices, entitlement grants, and ad credit consumption depend on.

📄️ 1. Overview

Phase 1 builds the billing catalog — the foundation that every future billing action (invoicing, payment, entitlement grants, ad consumption) will read from. Before we can issue a single invoice, we need three things in place: who is selling, what is being sold, and at what price in which market.

📄️ 2. Data Model

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