All "disclosures required under this part [Reg. E, including Section 1005.9] shall be clear and readily understandable, in writing, and in a form the consumer may keep." In order to comply with that requirement, you have two choices: paper or ESIGN. Since this product is strictly tree-free, then you must march each new accountholder through ESIGN's informed demonstrable consent drill at the time the account is opened. We've had extensive discussions of the relationship between ESIGN and deposit statements since 2000--when both ESIGN and BOL came into existence. There are lots of old threads that might help.
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...gone fishing.