Posts about reliability
System breakdown: why a refund takes days when the payment took seconds
You cancel an order and the app says the refund has started. Your bank shows nothing for days. Here is where the money is in between, and which parts of the delay a shop can and cannot change.
System breakdown: why the 'order placed' screen sometimes lies
The app says your order is placed. Four minutes later it says one item is gone. Here is what the first screen really means, and how a well-built system keeps that promise honest.
System breakdown: what stops a double charge when you tap Pay twice
The network drops just after you press Pay with your mobile wallet. You press again. Here is how a well-built checkout makes sure you pay once.