; (BB) be available to households at least 99 percent of the time; and (CC) include any other features required by the Secretary. (dd) (AA) The Secretary shall maintain a list of required user interfaces for purposes of item (aa), which may include a web-based online portal and a mobile application. (BB) The list under subitem (AA) shall include an application programming interface through which at least 1 user interface offered by a State under item (aa) allows households to delegate access to some or all account features identified by the Secretary to third-party provided software. No fee shall be charged to any party for the use of that application programming interface. (CC) During the 10-year period following the date on which the regulations promulgated pursuant to clause (i) become final, unless the Secretary extends that period, the Secretary shall maintain on the list under subitem (AA) the following user interfaces: text message, voice telephone service, and a nondigital user interface that does not require the use of a phone or computer by the household. (II) (aa) Each State shall provide households on an opt-in basis— (AA) through each digital user interface offered under subclause (I), timely electronic notice of transactions using the EBT account of the household