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Express Checkout Was Slower Than Regular Checkout

A/B tested. Shop Pay added 600ms to load time. Conversion rate was actually lower than standard checkout.

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

Shopify crashed and it blanked the screen. Eventually I uninstalled the app and everything worked again.

The Discovery

The reality: you only find out when revenue drops. I test after every change. The most confusing part? It had been broken for weeks. What still gets me is this could have been avoided.

My New Routine

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

The most embarrassing part? Nobody noticed. I test before any launch. Turns out the script was corrupted. What still gets me is the platform should catch this.

  1. Turns out the setting was corrupted.
  2. Eventually I patched it manually and things went back to normal.

The Math

I test religiously. Eventually I found a workaround and the problem was resolved. Here is the thing: testing your own store is the only safety net. What still gets me is the platform should catch this.

✅ Pro tip: I spent a month trying to fix what was happening.

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

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