Dev notes, case studies, and reflections on building high-concurrency systems, digital architecture, and engineering infrastructure from Africa.
When network jitter causes mobile networks to retry billing notifications 4 times within 800ms, standard DB locks fail under load. Here is how we implemented distributed Redis token buckets to achieve zero duplicate charges across West African payment rails.
const key = `idemp:charge:${txId}`;
const acquired = await redis.set(
key,
"IN_PROGRESS",
"NX",
"EX",
30
);
// Short-circuit duplicate webhooks
if (!acquired) {
return res.status(200).json({
status: "replayed_deduped"
});
}When network jitter causes mobile networks to retry billing notifications 4 times within 800ms, standard DB locks fail under load. Here is how we implemented distributed Redis token buckets to achieve zero duplicate charges across West African payment rails.
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