The Golden Rule of Payout Systems: Why "Pending" is Never a Failure

<p><em>Five submissions to MTN Mobile Money's sandbox, and what they cost me to learn.</em></p> <p>On 16 September I put a catch-all recorder behind a Cloudflare tunnel, created a

<p>Your AI system isn't going to crash. It's going to drift.</p> <p>A recommendation engine making 1.4 model calls instead of 1. A retrieval pipeline fetching 5 chunks instead of

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<p>Most LLM API error handling starts out looking like normal HTTP error handling.</p> <p>If it is a <code>429</code>, retry later.</p> <p>If it is a <code>500</code>, retry with

<p>This guide takes you from "I integrate HyperPay/Paymob/Stripe webhooks" to "I can design the payment infrastructure of a fintech company." It's written assuming PHP 8.x +

<blockquote> <p>Episode 3 covered detection — how a system finds out something broke. Episode 4 is the next link: detection told you something's wrong, now what?</p> </blockquote>

<p>At the end of March, an accounts payable clerk at a supplier called Wei, the finance director of a 500-person equipment manufacturer, to ask a small question. Why had she

<p>I was asked to look at a fintech backend where something small but persistent kept happening. Every month when the finance team tried to close the books, the internal ledger