Which innovative retail payment system was FIRST adopted by commercial space tourism companies to handle the unique challenges of space travel deposits?

Space tourism is rapidly evolving from science fiction to a commercial reality. Major astronomy-focused retail companies are developing innovative purchasing systems to handle the unique challenges of selling space travel experiences. Test your knowledge about the cutting-edge retail payment innovations in the emerging space tourism industry!

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Orbital Escrow Accounts - a multi-phase payment system that releases funds at specific mission milestones
Stellar Cryptocurrency - a space-specific digital currency backed by asteroid mining potential
Gravity-Free Payment Protocol - a biometric authentication system designed to work in zero-G environments
Cosmic Layaway Plans - allowing customers to reserve seats on flights up to 15 years in advance with incremental payments