You can select whether to use a splash page for your online store. This feature is set as ‘enable’ if the store is only open to adults or to customers with an account.
Online store splash page
You can use a splash page to require customers to enter your store after account verification.
To establish age restriction settings, go to [My Store > Store setup > General settings > (tab) Store/Security settings].
Online stores that require age verification cannot use the SNS account sign-in as SNS account does not provide birthday information.