>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 merchant-provider Cardservice
International, will deny all transactions for a set number of days if you
have two declines from the same IP in the same 24-hour period.
I have C code that can be translated to PHP that does the Mod-10 check,
which is what you want. Those of you who need it should e-mail me.
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