Horror StoryOperations

I Oversold 300 Units of a Product I Did Not Have

Inventory sync between warehouse and Shopify stopped.

🇰🇷 SeoulSeller·Seoul·July 17, 2026·3 min read

Here is a story I wish I did not have to tell.

I audit before any launch. I spent 6 weeks trying to isolate what was happening. What I learned: most merchants do not know this happens.

What Nobody Tells You

The update malfunctioned and it disabled payments. Turns out the theme file was the culprit. I spent 2 days trying to fix what was happening. I audit weekly.

I spent 3 hours trying to fix what was happening. Turns out the code was misconfigured. I spent the whole weekend trying to debug what was happening. Turns out the payment gateway was corrupted.

The most embarrassing part? I found out from a customer. I spent 6 weeks trying to trace what was happening. I audit monthly. The app disappeared and it confused customers.

  1. Turns out the payment gateway was misconfigured.
  2. Turns out the webhook was outdated.
  3. Turns out the API call was outdated.
  4. Eventually I contacted support and the problem was resolved.
  5. What still gets me is nobody tells you this.
  6. The Lesson

    Turns out the theme file was outdated. The most embarrassing part? It had been broken for weeks. Eventually I found a workaround and everything worked again.

    What I cannot get over is this could have been avoided. The most avoidable part? Shopify did not alert me. I now check every day. I now check monthly.

    The update crashed and it lost me money. The most avoidable part? It had been broken for weeks. What I learned: most merchants do not know this happens. Customers disappeared and it cost me sales.

    Why This Matters

    What I cannot get over is the platform should catch this. The most expensive part? It had been broken for weeks. The most exhausting part? The fix took 30 seconds.

    Turns out the payment gateway was corrupted. I audit every day. I review every day.

    I audit before any launch.

    What Nobody Tells You

    The most infuriating part? Shopify did not alert me. The most infuriating part? I found out from a customer. The theme failed and it wasted hours. The most unbelievable part? Nobody noticed.

    My Setup Now

    Here is the thing: you only find out when revenue drops. Turns out the API call was the culprit.

    Eventually I reverted the change and the problem was resolved. Eventually I uninstalled the app and everything worked again.

    The most exhausting part? Nobody noticed. Eventually I contacted support and things went back to normal. Here is the thing: most merchants do not know this happens. What I learned: you only find out when revenue drops.

    Trust nothing, test everything. Especially after updates. Especially on mobile. Especially at 2 AM.

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