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When plans overwrote each other and the finance team had no audit trail, this microservice replaced the entire billing layer. 38 business rules enforced at the database. 9 ledger operations. Mercado Pago. Multi-country tax. Delivered in 7 weeks.
NONO Soluciones operates the HunterX platform — a background-check service used by companies across multiple countries to verify employees, domestic workers, contractors, and tenants against 25+ official sources. As the platform expanded from one country to multi-country operations, the billing layer that worked for a handful of plans couldn't keep up. Every new product line and every new market meant rebuilding commercial logic from scratch.
These are the operational bottlenecks that AI automation eliminates in a 2-week pilot.
Plans overwrote each other — buying a new plan replaced the previous one. Customers lost access to purchased services mid-cycle. Support tickets spiked after every billing event.
Zero credit traceability — no wallet system, no transaction ledger. Finance couldn't answer "how many credits did client X consume last month?" without manual Excel reconciliation.
Add-ons were hard-coded to specific plans. Selling an add-on on any active plan was architecturally impossible — blocking a revenue channel clients were asking for.
Every new country or product line required rebuilding the commercial model. Expansion meant rebuilding billing logic from scratch — linear cost growth with each market.
An independent Python/FastAPI microservice that replaced the entire commercial layer in 7 weeks. The architecture separates every concern into its own domain: Services define what's sold, Products package them for pricing, Prices vary by country and currency, Subscriptions support multiple active plans per client, Add-ons are independent entitlements sellable on any plan, Wallets hold typed credit pools, and the Ledger records every transaction immutably across 9 operation types with a two-phase Reserve → Execute → Settle/Release flow. All 38 business rules are enforced as PostgreSQL constraints — not scattered in application code or tribal knowledge. Mercado Pago handles payments through an abstraction layer prepared for PayU and Stripe. ~3,500 legacy rows were migrated from MySQL with checksum-validated integrity. The delivery includes an AI agent trained in .github/ that assists future commercial logic changes — new pricing rules, tax adjustments, validation invariants — without CAMTECH dependency.
Every technology in this stack is production-proven across CAMTECH AI client engagements.
Service → Product → Price → Subscription → Wallet → Ledger. Every subscription, every credit consumed, every peso collected passes through the ledger. 38 database constraints validate every write before commit. Add-ons sell on any active plan. Multi-country tax engine calculates Colombia 19% and Ecuador 12% automatically.
Architecture diagram coming soon
The finance team now has a single source of truth for every peso billed and every credit consumed. Plans stack instead of overwriting. Add-ons unlock a new revenue channel — sell any add-on on any active plan. Multi-country tax engine calculates rates automatically per jurisdiction. AI agent assists future changes without CAMTECH dependency.
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