Checking Credit Cards (#122)
in [Ruby]
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From: anansi on 27 Apr 2007 16:09 James Edward Gray II wrote: > On Apr 27, 2007, at 12:58 PM, Matthew Moss wrote: >> So is a card number like "4012 3456 7890" a valid Unknown, or an >> invalid Visa? > > Visa Invalid > > Always match the type first. > Nope thats no Visa number but a unknown one. Visa Cards have a certain length (13 or 16) and if that length doesn't fit (Matthew's number here had just 12 digits)it's unknown :) otherwise the length would be obsolete don't you think? Both length and startingbytes have equal weight in the decision wether a card belongs to a known Company or not. -- greets ( ) ( /\ .-"""-. /\ //\\/ ,,, \//\\ |/\| ,;;;;;, |/\| //\\\;-"""-;///\\ // \/ . \/ \\ (| ,-_| \ | / |_-, |) //`__\.-.-./__`\\ // /.-(() ())-.\ \\ (\ |) '---' (| /) ` (| |) ` jgs \) (/ one must still have chaos in oneself to be able to give birth to a dancing star
From: James Edward Gray II on 27 Apr 2007 17:06 On Apr 27, 2007, at 3:10 PM, anansi wrote: > James Edward Gray II wrote: >> On Apr 27, 2007, at 12:58 PM, Matthew Moss wrote: >>> So is a card number like "4012 3456 7890" a valid Unknown, or an >>> invalid Visa? >> Visa Invalid >> Always match the type first. > > Nope thats no Visa number but a unknown one. Visa Cards have a > certain length (13 or 16) and if that length doesn't fit (Matthew's > number here had just 12 digits)it's unknown :) otherwise the length > would be obsolete don't you think? > Both length and startingbytes have equal weight in the decision > wether a card belongs to a known Company or not. You are right. I didn't read well. It's Unknown. James Edward Gray II
From: Raj Sahae on 27 Apr 2007 23:39 Tim Becker wrote: >> For completeness and to make this Quiz exercise valid to more people, >> can anyone include the information for other major credit cards from >> major countries? Japan: JCB, et. al., U.K.: Barclay, et. al. , etc... > > UK had Switch and Solo till recently which are now rebranded under the > Maestro umbrella. They're not really credit cards and basically no > rules exist, you have to check tables to determine valid prefixes and > card number length. Additionally, Maestro card numbers may also be > Mastercard numbers, so they can't be uniquely identified as being > Maestro. > > For JCB and Diner's: > > JCB 3528-2589 Length: 16 > Diners 3000-3029, 3040-3059, 36, 3815-3889, 389 Length: 14 > There's no way to differentiate between a JCB starting with 34 and an American Express card that starts with 34 given those starting numbers. Raj
From: Mark Day on 27 Apr 2007 23:47 On Apr 27, 2007, at 8:39 PM, Raj Sahae wrote: > Tim Becker wrote: >>> For completeness and to make this Quiz exercise valid to more >>> people, >>> can anyone include the information for other major credit cards from >>> major countries? Japan: JCB, et. al., U.K.: Barclay, et. al. , >>> etc... >> >> UK had Switch and Solo till recently which are now rebranded under >> the >> Maestro umbrella. They're not really credit cards and basically no >> rules exist, you have to check tables to determine valid prefixes and >> card number length. Additionally, Maestro card numbers may also be >> Mastercard numbers, so they can't be uniquely identified as being >> Maestro. >> >> For JCB and Diner's: >> >> JCB 3528-2589 Length: 16 >> Diners 3000-3029, 3040-3059, 36, 3815-3889, 389 Length: 14 >> > There's no way to differentiate between a JCB starting with 34 and > an American Express card that starts with 34 given those starting > numbers. Tim corrected his typo: >> > JCB 3528-2589 Length: 16 > > should be 3528-3589, obviously. So I don't think a leading 34 is ambiguous. It would be American Express, with an expected length of 15 digits. -Mark
From: Raj Sahae on 28 Apr 2007 00:44
Mark Day wrote: > On Apr 27, 2007, at 8:39 PM, Raj Sahae wrote: > >> Tim Becker wrote: >>>> For completeness and to make this Quiz exercise valid to more people, >>>> can anyone include the information for other major credit cards from >>>> major countries? Japan: JCB, et. al., U.K.: Barclay, et. al. , etc... >>> >>> UK had Switch and Solo till recently which are now rebranded under the >>> Maestro umbrella. They're not really credit cards and basically no >>> rules exist, you have to check tables to determine valid prefixes and >>> card number length. Additionally, Maestro card numbers may also be >>> Mastercard numbers, so they can't be uniquely identified as being >>> Maestro. >>> >>> For JCB and Diner's: >>> >>> JCB 3528-2589 Length: 16 >>> Diners 3000-3029, 3040-3059, 36, 3815-3889, 389 Length: 14 >>> >> There's no way to differentiate between a JCB starting with 34 and an >> American Express card that starts with 34 given those starting numbers. > > Tim corrected his typo: > >>> > JCB 3528-2589 Length: 16 >> >> should be 3528-3589, obviously. > > So I don't think a leading 34 is ambiguous. It would be American > Express, with an expected length of 15 digits. > > -Mark > Sorry, didn't see that email for some reason, even though it's right here in my inbox. . . Raj |