[bop-devel] Fraud detection hooks

[Ben Grimm]

I'm wondering if there's been any thought to adding hooks to handle CVV2 and 
AVS response codes in a uniform way? Payment gateways handle this in very 
different ways... some map response codes back to VISA's standard list 
others don't, some allow automatic rejection based on rules, others leave 
the logic up to you. 

It ought to be possible to map the set of AVS and CVV2 response codes from 
each of the gateways back to a sensible set of flags. e.g. reject if no 
match, reject if partial match, cvv2 missing, etc... It could be done 
outside of BOP, but the approval logic seems to fit neatly between authorize 
and capture (or sale followed by an automatic void if rejected).

-- Ben
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