Updates to Stripe Terminal Software for Custom Accounts and Express Accounts. This Section 2.4 applies if you have Custom Accounts or Express Accounts. Stripe, or the licensor of the Stripe Terminal Software, may from time to time make available Updates to the Stripe Terminal Software. An Update is mandatory unless Stripe designates it as optional or discretionary. Stripe will notify you of each mandatory Update that it does not push to your Custom Accounts and Express Accounts. Upon receipt of an Update notice from Stripe, you must immediately notify your Custom Accounts and Express Accounts that use the Stripe Terminal Services (a) of the Update; (b) whether the Update is mandatory, optional or discretionary; (c) if the Update is mandatory, the deadline for installing the Update; and (d) that they may not be able to continue using the Stripe Terminal Services if they do not install the mandatory Update by the deadline. You must ensure that your Custom Accounts and Express Accounts install each mandatory Update by the date or within the time period stated in the notice; or, if there is no date or period stated in the notice, then no later than 30 days after the date of Stripe’s notice.