There's no magic language needed. Just be sure you hit all the pre-opt-in disclosures enumerated in Section 101(c)(1)(B) and (C) of ESIGN:
- any right or option of the consumer to have the record provided or made available on paper or in nonelectronic form
- the right of the consumer to withdraw the consent to have the record provided or made available in an electronic form and of any conditions, consequences (which may include termination of the parties’ relationship), or fees in the event of such withdrawal
- whether the consent applies:
-- only to the particular transaction which gave rise to the obligation to provide the record, or
-- to identified categories of records that may be provided or made available during the course of the parties’ relationship
- a description of the procedures the consumer must use to withdraw consent and to update information needed to contact the consumer electronically
- a statement of how, after the consent, the consumer may request a paper copy of an electronic record, and whether any fee will be charged for such copy
- a statement of the hardware and software requirements for access to and retention of the electronic records
As with all ESIGN opt-ins, you will need to obtain demonstrable consent.
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...gone fishing.