What companies issue card numbers that are not 16 numbers? Are
they non-US cards? I haven't ever seen a card that wasn't 16 numbers.
A valid VISA card has between 13-16 digits.
I believe AMERICAN EXPRESS only has 15 digits.
-john
__John Monfort_
I know that credit cards have standard formats: There's a standard
number of digits, and whether the card is Visa, MC, Amex, etc is
encoded in the number, and there is some kind of checksum, and I think
the expiration is also encoded in the number. All of this is obvious
stuff that anyone
On 16 Jul 2001, Dr. Evil wrote:
I'm wondering if anyone can refer me to a site that describes what
this format is, so I can write some PHP code that will check to see if
a credit card number format is correct. I don't even want to try to
run the card through my merchant account if the
Dr. Evil pressed the little lettered thingies in this order...
I know that credit cards have standard formats: There's a standard
number of digits, and whether the card is Visa, MC, Amex, etc is
encoded in the number, and there is some kind of checksum, and I think the
expiration is also
John Donagher pressed the little lettered thingies in this order...
My suggestion is to run an authorization for an extremely small amount of
money ($1.00 is fairly standard) and that will tell you if the account is
valid or not. Doing validation yourself implies a fully-publicly-understood
Christopher Ostmo wrote:
By law, the numbers are supposed to be
generated at random and not generated by any kind of algorithm or
formula.
CC# must pass the Luhn MOD 10 formula, so the generated numbers can't be
(totally) random - they have to conform to the formula.
Also, not all
Pearson
-Original Message-
From: Dr. Evil [mailto:[EMAIL PROTECTED]]
Sent: Monday, July 16, 2001 3:12 PM
To: [EMAIL PROTECTED]
Subject: [PHP] Credit card number checker?
I know that credit cards have standard formats: There's a standard
number of digits, and whether the card
Christopher Ostmo wrote:
My suggestion is to run an authorization for an extremely small amount of
money ($1.00 is fairly standard) and that will tell you if the account is
valid or not. Doing validation yourself implies a fully-publicly-understood
Maybe I am the only one, but I would
Dr. Evil pressed the little lettered thingies in this order...
Thanks for the tip, but... there is a checksum in the CC card, which
is worth checking. Some others have sent me some code that checks
that. Or is that no longer valid?
Actually, I saw that... and maybe I'm wrong.
When I
Dr. Evil wrote:
I'm wondering if anyone can refer me to a site that describes what
this format is, so I can write some PHP code that will check to see if
a credit card number format is correct. I don't even want to try to
run the card through my merchant account if the format is obviously
PROTECTED]]
Sent: Monday, July 16, 2001 4:49 PM
To: John Donagher
Cc: [EMAIL PROTECTED]
Subject: Re: [PHP] Credit card number checker?
John Donagher pressed the little lettered thingies in this order...
My suggestion is to run an authorization for an extremely small amount of
money ($1.00 is fairly
!;
}
---
Good Luck!
Nathan Cook
[EMAIL PROTECTED]
- Original Message -
From: Dr. Evil [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Monday, July 16, 2001 4:12 PM
Subject: [PHP] Credit card number checker?
I know that credit cards have standard formats
Ashley M. Kirchner pressed the little lettered thingies in this order...
Christopher Ostmo wrote:
By law, the numbers are supposed to be
generated at random and not generated by any kind of algorithm or
formula.
CC# must pass the Luhn MOD 10 formula, so the generated numbers
On Mon, 16 Jul 2001, Christopher Ostmo wrote:
John Donagher pressed the little lettered thingies in this order...
My suggestion is to run an authorization for an extremely small amount of
money ($1.00 is fairly standard) and that will tell you if the account is
valid or not. Doing
Christopher Ostmo wrote:
What companies issue card numbers that are not 16 numbers? Are
they non-US cards? I haven't ever seen a card that wasn't 16 numbers.
The ones I care for when I do eCommerce apps:
Visa: 13, or 16 digits
MasterCard: 16
AmEx: 15
Christopher Ostmo wrote:
Dr. Evil pressed the little lettered thingies in this order...
I know that credit cards have standard formats: There's a standard
number of digits, and whether the card is Visa, MC, Amex, etc is
encoded in the number, and there is some kind of checksum, and I
John Donagher pressed the little lettered thingies in this order...
Note, I said authorization, not charge. An authorization is a form of sale
which is really a two-step process. The authorization places a hold on the
funds, and then a capture transaction is initiated which indicates that
From 'John Donagher':
accounts, and too many bogus cards would not look good.
My suggestion is to run an authorization for an extremely small amount of money
($1.00 is fairly standard) and that will tell you if the account is valid or
not.
Bad idea.
Some software, in particular that from
On 17 Jul 2001, Steve Sobol wrote:
From 'John Donagher':
accounts, and too many bogus cards would not look good.
My suggestion is to run an authorization for an extremely small amount of money
($1.00 is fairly standard) and that will tell you if the account is valid or
not.
Bad
On 16 Jul 2001 22:12:24 -, Dr. Evil [EMAIL PROTECTED] wrote:
I know that credit cards have standard formats: There's a standard
number of digits, and whether the card is Visa, MC, Amex, etc is
encoded in the number, and there is some kind of checksum, and I think
the expiration is also
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