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PR REVIEWMissing Idempotency in Payment Webhooks#1042StripeAirbnb
⏱ 00:00Mid~15 min
PULL REQUEST
Open#1042 · 1 commit
Missing Idempotency in Payment Webhooks
mid-dev-44 wants to mergefeat/webhook-handler→main
MI
mid-dev-44
1 file changed · 2 hours ago
YOUR MISSION
The customer support team is flooded with tickets. Users are complaining they are being double-charged for "Pro" credits. The junior says "I checked the code, we only call the increment function once per request!"
Mid~15 min
HINTS (0/3 used)
REVIEWING AS
SR
Senior Engineer
@ Stripe · Backend Platform
src / api / webhooks / stripe.ts+2 −0
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export async function handleStripeWebhook(req: Request, res: Response) {
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const event = req.body;
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if (event.type === "charge.succeeded") {
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const { userId, amount } = event.data.object.metadata;
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// Grant credits to user
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await db.user.incrementBalance(userId, amount);
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}
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return res.sendStatus(200);
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}
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