If the customer is overdrawn, you have extended credit and are attempting to collect it. According to the FCRA, a consumer report can be provided:
(3) To a person which it has reason to believe
(A) intends to use the information in connection with a credit transaction involving the consumer on whom the information is to be furnished and involving the extension of credit to, or review or collection of an account of, the consumer; or
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.