I have a fun story about a card with an unusual number of digits!
I worked for a very large department store on their mobile app. They issued their own in-store credit cards that only had 9 digits and didn't pass the LUHN check.
They jumped into e-commerce a loooong time ago so the tech stack was showing it's age and they didn't have real test servers. (They did but they were almost always unusably slow.) We did almost all of our testing against the production servers. This was fine because we were mostly just loading product pages and building shopping carts.
Normally for testing checkouts we'd use bogus credit cards like 4111 1111 1111 1111, which passes the LUHN check but is obviously a non-working card so our order would fail.
We had to check the in-store card processing a little differently and would test with the number 123456789, thinking that surely couldn't be a real card number. (You may see where this is going.)
We ended up typing out a lot of addresses so we usually picked one with the first state in our state picker, Alaska. Then we found the shortest city name in Alaska, which is Tok (there's a couple other three letter towns in AK but that's what we usually chose.)
One day, someone decided to check the order history of the account we were using to place those test orders. They noticed a tracking number and clicked on it. We had sent several dresses to 1 A St. in Tok Alaska. It was the longest tracking list I've ever seen with several delays and problems that could only occur when shipping to a fairly remote town in Alaska. (I believe avalanche was one of the listed reasons.)
I worked for a very large department store on their mobile app. They issued their own in-store credit cards that only had 9 digits and didn't pass the LUHN check.
They jumped into e-commerce a loooong time ago so the tech stack was showing it's age and they didn't have real test servers. (They did but they were almost always unusably slow.) We did almost all of our testing against the production servers. This was fine because we were mostly just loading product pages and building shopping carts.
Normally for testing checkouts we'd use bogus credit cards like 4111 1111 1111 1111, which passes the LUHN check but is obviously a non-working card so our order would fail.
We had to check the in-store card processing a little differently and would test with the number 123456789, thinking that surely couldn't be a real card number. (You may see where this is going.)
We ended up typing out a lot of addresses so we usually picked one with the first state in our state picker, Alaska. Then we found the shortest city name in Alaska, which is Tok (there's a couple other three letter towns in AK but that's what we usually chose.)
One day, someone decided to check the order history of the account we were using to place those test orders. They noticed a tracking number and clicked on it. We had sent several dresses to 1 A St. in Tok Alaska. It was the longest tracking list I've ever seen with several delays and problems that could only occur when shipping to a fairly remote town in Alaska. (I believe avalanche was one of the listed reasons.)
Sorry to whoever had that card!