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Duplicate Stripe Webhooks Double-Credited Users; An Atomic MongoDB Update Fixed It

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A developer building a coin system for the social streaming platform Eyerone discovered that some users were credited twice for a single Stripe payment. The cause was a race condition: the webhook and the success-page fallback could both read the order as pending before either saved the paid status. Switching to a single findOneAndUpdate that matches only pending orders ensures only one request succeeds. Wrapping the order update and the coin credit in a MongoDB transaction also prevents a crash from leaving users charged without receiving coins.

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