(a) A written request for disclosure in physical or electronic form;
(b) An original or copy of the power of attorney expressly granting the agent authority over the content of electronic communications of the principal;
(c) A certification by the agent, under penalty of perjury, that the power of attorney is in effect; and
(d) If requested by the custodian:
(i) A number, username, address or other unique subscriber or account identifier assigned by the custodian to identify the principal’s account; or
(ii) Evidence linking the account to the principal.