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McDonald's app bug let people order for free in France

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Re: McDonald's app bug let people order for free in France

#72
post #36

It might be a stunt, but stuff like that happens. Many years ago I used to work for a large European company that ran a booking system for several hundreds of airlines. The system was used as a back-end by more than one famous online booking site. Currency rates were updated automatically. Once, on a new year's eve, at midnight, a glitch slipped into the Canadian dollar conversion rate, setting 1 CAD to 0 EUR. All of…

Recently my company (well known company/brand) someone created a coupon code that made your total 0 dollars.

Apparently around 400 orders had been made using it before it was found, which on the scale of things isn't as bad as it could have been

From what I followed it didn't seem malicious, it was a broken attempt to implement a referral bonus

Re: McDonald's app bug let people order for free in France

#73
post #36

It might be a stunt, but stuff like that happens. Many years ago I used to work for a large European company that ran a booking system for several hundreds of airlines. The system was used as a back-end by more than one famous online booking site. Currency rates were updated automatically. Once, on a new year's eve, at midnight, a glitch slipped into the Canadian dollar conversion rate, setting 1 CAD to 0 EUR. All of…

Recently my company (well known company/brand) someone created a coupon code that made your total 0 dollars. Apparently around 400 orders had been made using it before it was found, which on the scale of things isn't as bad as it could have been From what I followed it didn't seem malicious, it was a broken attempt to implement a referral bonus

On what level do those happen? Actually tweaking code, or some higher-level interface? (I wonder why this is even possible to do)

Re: McDonald's app bug let people order for free in France

#74
I ordered a MacBook Pro (though Pink/Rose Gold) for 29999.99 RSD (255.46 €, 279.63 $). It was supposed to cost 299999.99 -- 2,796.29 $ or 2,554.55 € (extra 9). The order was cancelled with no explanation, obviously. Laws in Serbia do allow for a sale to be cancelled before delivery if the merchant entered the wrong price, or the device is not available in the warehouse, etc. It was funny :)

Re: McDonald's app bug let people order for free in France

#75
Back in 2014 EA issued a discount code for Origin that granted you $20 discount, with no minimum value and reusable. Myself and a couple friends managed to snatch 20 or 30 games before they deactivated it. It was pretty funny, and since it's just a digital product I don't think there's a reason to feel bad about it.

Re: McDonald's app bug let people order for free in France

#76
post #73

Earlier quoted context omitted.

Recently my company (well known company/brand) someone created a coupon code that made your total 0 dollars. Apparently around 400 orders had been made using it before it was found, which on the scale of things isn't as bad as it could have been From what I followed it didn't seem malicious, it was a broken attempt to implement a referral bonus

On what level do those happen? Actually tweaking code, or some higher-level interface? (I wonder why this is even possible to do)

CMS type interface

Technically it didn't make any order free actually... just 200$ cheaper and you could use it as many times as you liked.

They made a discount with the correct amount, but it was supposed to require a referral from a much bigger ticket item and they missed that

Re: McDonald's app bug let people order for free in France

#77
post #62

Earlier quoted context omitted.

But the people were already there, it only happened over the course of a single day; it's not like they paid the people more because they were busier or making more orders.

They can only handle so many orders in a given hour. If too many people took advantage of this, then queues probably got longer, discouraging potential customers.

Customers, who would've paid nothing anyway, presumably

Re: McDonald's app bug let people order for free in France

#78
post #53

Earlier quoted context omitted.

Amadeus? I remember at some point the French computer retailer had an issue when running a "buy 2 get 1 free" offer on blu-rays. One could remove the two bought items from the cart and the free one would remain. Repeat ad-libidum. Last year Amazon ran an offer where all photographic gear cost $94. All of it, even lenses which retailed for over 13k. https://www.usatoday.com/story/tech/2019/07/19/amazon-prime-... If th…

I won the lottery on a similar issue. I was looking at monitors on Amazon using a business account, which sometimes offers volume discounts. Instead of a $10 discount, someone had set the unit price to $10 if you bought more than one, for a $1100 monitor. I bought five. I expected the order to be cancelled, but a week later five monitors showed up.

Along the same lines, I was shopping for fuel injectors and someone listed a particular part number at like $1.50ea. So now, years later, I have a peanut butter jar fulled of 24lb/hr EV1 injectors that are not the right flow rate for anything I own but hey, maybe I'll use them eventually. It's nice to find a pricing error but it's rare to be in a position to actually use or be able to re-sell multiple units.

Re: McDonald's app bug let people order for free in France

#79
post #46
post #41

Earlier quoted context omitted.

I always wonder why systems like this so rarely do even basic plausibility checks before data is updated.

IKR Once my brother wired 10M EUR from Austria instead of 10M HUF. The exchange rate is above 1:300. Needless to say, he didn't have 10M EUR on that account. Like, ever. Not even close. I still have no idea why the bank let him wire more money than he had especially on this magnitude. They reverted it but we needed to cover the spread which caused an almost 10k eur loss. That hurt. I have once accidentally copied my…

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Re: McDonald's app bug let people order for free in France

#80

I ordered a MacBook Pro (though Pink/Rose Gold) for 29999.99 RSD (255.46 €, 279.63 $). It was supposed to cost 299999.99 -- 2,796.29 $ or 2,554.55 € (extra 9). The order was cancelled with no explanation, obviously. Laws in Serbia do allow for a sale to be cancelled before delivery if the merchant entered the wrong price, or the device is not available in the warehouse, etc. It was funny :)

That kind of thing happens in Australia and the sale must go ahead by law. The advertised price is the price, end of story.
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