I operate an audiotext company and we request a hand written statement authorizing charges as well as a copy of the credit card used (front and back) and valid photo ID once a customer has reached a certain point.
When we request it depends mostly on how many calls the guy is doing (since charge back ratios are calculated on transactions, not $), combined with how new of a customer he is and how many total dollars. My charge backs sit at less than .003 right now and those we request to send info in are blocked until such info is received. My dispatchers are given discretion to block and the office manager also blocks people every night based on numbers.
We also offer free memberships and calls to customers who do fax in so many who aren't even in jeopardy do so...it just helps to protect. I've only had to fight one charge back with the info but it did get the charge back reversed!
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