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Use 1111 2222 3333 4444, the credit card test number. This is valid at the check digit level, but known to all banks as a test number to be rejected.



I suspect there are many interfaces that would reject this number, as it's not a visa, master card or amex (which start with a 4, 5 and 3 respectively).

5105105105105100 and 4111111111111111 might be better alternatives (other test numbers that also pass the luhn check).


And when using email addresses to test your software always use [something]@test.com instead of [whatevs]@example.com because the people at test.com love getting your random test data.

/sarcasm Don't do this. http://contactx.test.com/contactX/contact-spam.cfm


Thanks for the tip, that may be useful in the future!

I ended up using my bank's "virtual credit card" service to create a virtual CC with a balance of 1 SEK to get rid of my Uber account. Anyway, I think this is shameful of them.

I would be ashamed of this practice if I worked for them. There is no excuse. You can't blindly blame it on A/B evaluations and what ended up making the company the most money. It's simply unethical.


> I would be ashamed of this practice if I worked for them.

There's no shame because there are no consequences. "Oh, you were the guy at Company X that wrote that annoying Dark Pattern Y, huh? Can you walk me through the ethics of that?" - Said no interviewer ever.


I was just discussing this with a former co-worker. [Here in Europe.]

Also: I'm pretty certain that if you had a history of using dark patterns.. that would be seen as basically fraudulent behavior here. Investors would stay far away.

We both shared our distaste for a typical american way of accomplishing personal financial success - fake it til you make it, etc etc.

Maybe this is a part of what sets SV apart from Europe - and why SV keeps winning :). Fraud works.


cough Volkswagen cough


Sneaky germans.




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