FLEXKEY Partners with SaunaLium Koenji to Boost Revenue Using Unutilized Time Slots FLEXKEY has partnered with SaunaLium Koenji, providing a subscription service that utilizes off-peak hours, generating additional revenue for the facilities.

FLEXKEY Partners with SaunaLium Koenji to Boost Revenue Using Unutilized Time Slots #Japan #Tokyo #Subscription_Service #FLEXKEY #SaunaLium