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