ProcureAI

Bulk buying in Nigeria runs on WhatsApp voice notes, "send half now", and trust. I wanted the buyer to be able to prove what happened afterwards, and to never pay a stranger up front.

• 01One sentence in; vendor replies in messy human language come out as one comparable table
• 02Kora checks each vendor is a registered business and that the payout account is theirs
• 03Money is held, 30% released to the vendor to start, 70% on a 6-digit delivery code
• 04Postgres triggers enforce eight invariants, so the rules hold even if the app code is wrong
• 05254 automated tests: unit, integration against a real Postgres, and Playwright end to end

Money has to be exact and every failure has to have a defined behaviour: duplicate, forged and missing webhooks, timeouts, double clicks. Each one has a test.